The Erased Historians

I felt the visitor before I saw him. There was a slight change in the air pressure and a faint electric tingle at the base of my skull. I had become good at noticing the signs. Some might have called it a sixth sense.

The Temporal Security Directorate called it a tactical advantage worth paying me an obscene amount of money for.

The derelict bonded warehouse in the Royal Docks looked empty to anyone else, but I knew better. I adjusted the calibration of my graphene-weave field suit, and the material tightened around my joints. The TSD, with its deliberately vague Ministry of Defence support, spared no expense on our equipment.

The suit had joint seals, environmental controls and an encrypted link to TSD headquarters. Its lightweight armour could stop most conventional weapons. But the suit was not what made me valuable. I could feel what their satellites and sensors could not detect.

I moved through the shadows between stacked shipping containers, my nullifier pistol ready in my right hand.

The weapon looked simple enough: matt black and no larger than a standard service pistol. Its technology was anything but simple. A single shot collapsed the target's molecular structure and left no residue. Clean, efficient and final.

Five months earlier, I would not have given a second thought to what I was about to do.

When the Temporal Security Directorate recruited me, its officers had made everything sound straightforward. Visitors from the future were unauthorised temporal infiltrators who threatened national security. My job was to find them and erase them. A recruitment payment cleared my university debt and overdraft, while a monthly salary supplement allowed me to live in an expensive modern flat overlooking the Thames.

All because I could feel when someone did not belong in this time.

"Target still in the north-east corner?" asked the mission controller through my earpiece.

"Confirmed," I whispered, knowing the throat microphone would catch it. "Moving in now."

I crept along the wall, past broken windows and layers of graffiti. The visitor was close. The pressure inside my head increased with every step.

He had taken the appearance of a middle-aged man in ordinary clothes, but there was always something slightly wrong about visitors. This one's clothes looked just a little too new. His posture was too straight for someone supposedly exploring an abandoned warehouse. He stood with his back to me, manipulating a device that projected a holographic display visible only from his position.

Standard visitor technology. They always brought tools from their own time.

I raised the nullifier and aimed at the centre of his back. One shot, one fewer temporal threat.

That was what my training said. It was what the TSD had drilled into me through countless simulations and previous field operations. But lately I had begun to notice things.

The visitors never seemed aggressive. They rarely carried weapons. They spent most of their time observing, recording and measuring, more like scientists or researchers than infiltrators or saboteurs.

The doubt lasted only a second.

I pulled the trigger.

The nullifier beam struck him squarely between the shoulder blades. He did not scream. There was no time. His body glowed briefly from within, then folded in upon itself and vanished, leaving only a faint disturbance in the dust on the concrete floor.

I approached the place where he had been standing and searched for anything he might have dropped. Protocol required me to recover all visitor technology for TSD analysis. Usually their devices disintegrated with them, presumably because of some fail-safe bound to their biological signatures.

This time was different.

Beneath a collapsed section of loading gantry lay a book.

I picked it up. There was no title on the cover or spine.

When I opened it, I found pages filled with text in a language I had never seen, accompanied by intricate diagrams and illustrations. Standard procedure was clear: bag it, tag it and hand it over.

But something made me hesitate.

Perhaps it was the fact that the book had survived when everything else the visitor carried had disappeared. Perhaps it was the way the strange symbols appeared to shift when I was not looking directly at them.

I made a decision that would change everything.

I slipped the book into the cargo pocket of my suit.

"Mercer, report. Target neutralised?" The controller sounded impatient now.

"Target eliminated," I confirmed. "No recoverable technology. Area secure."

"Understood. Return to the extraction point."

Back at headquarters, I went through the standard debriefing: mission parameters, target description, method of elimination and confirmation of complete molecular collapse. I said nothing about the book.

For the first time since joining the TSD, I deliberately withheld information.

Three hours later, I sat at my kitchen table with the strange volume open in front of me. The lights of my riverside flat reflected in the windows. In the glass I could see my own face, dark hair and hazel eyes. I pushed the sight aside and concentrated on the book.

The text resembled no language I recognised. The diagrams, however, made a degree of sense. They showed what appeared to be battle formations, troop movements and terrain maps.

As I turned the pages, I began to recognise places: fields in Europe, deserts in Africa and the Middle East, and jungles in Asia and South America.

One illustration made me stop.

It could only have shown the Battle of Hastings, but it presented the battlefield from a viewpoint no artist in 1066 could have captured. It was as though the scene had been observed from high above Senlac Hill near Battle Abbey. The positions of the forces matched historical accounts, but the image contained details I had never seen in any history book. Notes in the same strange language pointed to precise locations across the battlefield.

This was not simply a book.

It was a record of human warfare, documented with impossible accuracy and detail.

I closed it and leant back, staring through the windows at London and the dark Thames. The TSD had told us that visitors were threats, perhaps seeking to change history or gather intelligence that could damage national security.

But what if they were something else entirely?

What if everything I had been told, and everything I had done, was founded upon a lie?

I could not hand the book to the Directorate. Not until I understood what it meant. Not until I knew the truth about the people I had been killing.

Three weeks later, I sat in the waiting area outside Director Sir Malcolm Vane's office with my resignation letter in my jacket pocket. Every night spent studying the book's mysterious pages had strengthened my conviction that I could no longer continue the work.

Vane's assistant looked up and nodded.

"He'll see you now."

I entered the familiar office. A Union flag stood in one corner. Sir Malcolm Vane remained behind his immaculate desk and did not offer me a seat.

"I hoped you might reconsider, Mercer." He tapped the resignation letter lying open before him. "This is disappointing."

"My decision is final, sir."

Vane's blue eyes narrowed.

"Do you understand what you're walking away from? The work we do here is not merely about national security. It is about preserving the integrity of our timeline."

He leant forward, his palms flat on the desk.

"You have a gift, Adam. None of our other field officers can sense visitors with your accuracy. Shaw comes close, but even he misses signals you detect instinctively."

I kept my face expressionless and thought of the book hidden in my flat.

"I appreciate that, sir, but I've made my decision."

"Is this about the Royal Docks?" Vane asked. "If that operation is still troubling you..."

"It isn't about any particular operation," I said, careful to keep my voice steady. "I need a change. That's all."

Vane studied me for a long moment.

"Once you leave, your security clearance will be revoked. The salary supplement, equipment and protection all disappear."

I nodded. "I understand."

"The confidentiality agreement remains in force for life. You will never discuss what you did here with anyone."

His voice contained no overt threat, only cold certainty.

"Of course."

I held his gaze. After a moment, Vane sighed and sat down.

"Very well. Your resignation is accepted with immediate effect. Security will escort you while you clear your desk."

I stood and walked towards the door.

"Mercer," Vane called after me.

I paused.

"The door remains open if you change your mind. Some people find civilian life less fulfilling than they expected."

I left without looking back.

Six months later, my flat in Bristol bore no resemblance to the expensive place overlooking the Thames. There were no vast windows, no costly furnishings and no river view. It was a plain one-bedroom flat with floorboards that complained whenever I walked into the kitchen.

I had taken a job as a security consultant for a technology company. The work was dull, but it paid the bills and did not require me to kill anyone.

That morning, I was sitting at my second-hand table with tea and toast when my mobile phone vibrated with a news alert. I nearly knocked over my mug when I read the headline.

MORE THAN 2,600 DEAD IN SOLIHULL TERROR ATTACK

The footage showed smoke rising from a residential district. Officials described it as a chemical attack, but the smoke twisted upwards in a tight spiral, and I knew what it really was.

I had seen training recordings of temporal-vessel failures.

For the next hour, I searched news sites for details that might confirm my suspicion. The official account claimed that a terrorist cell had released an unidentified chemical agent in Solihull, neighbouring Birmingham. Yet the victims had been found without external injuries, while preliminary reports spoke of rapid molecular breakdown inside their bodies. That matched precisely what happened when temporal energy escaped without control.

Someone had brought down a visitor's vessel, and more than 2,600 innocent people were dead.

I paced my cramped sitting room. The book lay on the coffee table. I had made little progress with the text, but hours spent examining its diagrams of historical battles had left me increasingly convinced that the supposed threats were observers rather than enemies.

After another hour of arguing with myself, I picked up my phone and called a number I had promised never to use.

It rang three times.

"Shaw."

"It's me."

There was a pause.

"Adam? Christ, I didn't expect to hear from you." Peter sounded exhausted. "How have you been?"

"Forget the small talk, Pete. Solihull wasn't a terrorist attack."

The silence lasted so long that I thought he might have ended the call.

At last he said, "You shouldn't be discussing this. Not on this line. Not on any line."

"I need to know what happened. More than 2,600 people, Pete. Families. Children."

I heard him draw a deep breath.

"Meet me at Blackwell's in Oxford. Tomorrow, 14:00. The antiquarian-books section. Come alone."

He ended the call before I could answer.

Blackwell's spread through a bewildering succession of rooms, its shelves crowded with new and second-hand books. I found the quiet antiquarian-books section and spotted Peter examining an old volume in a corner.

He looked up as I approached. His grey eyes immediately checked the space behind me.

"You're not wearing a wire, are you?"

"Nice to see you as well," I said quietly.

Peter grimaced. "Sorry. It's been a rough week."

He looked thinner than when I had left the Directorate. The shadows beneath his eyes had deepened.

"Solihull," I said.

He nodded once and led me farther between the shelves, away from the nearest customers.

"It was meant to be a standard elimination. Intelligence detected unusual temporal-energy readings near the town. Vane sent two teams: Keane and me, plus Patel's crew."

"What went wrong?"

Peter rubbed a hand across his face.

"Everything. This visitor wasn't on foot. They had some sort of vessel. It was the first one we'd ever seen. Keane panicked and fired before we had proper confirmation."

"He hit the pilot."

My stomach tightened.

"And the vessel crashed."

"Yes, but that isn't the worst of it." Peter lowered his voice further. "Vane knew the risks. Patel warned him that firing on the vessel could cause a catastrophic temporal discharge. Vane accepted the warning and authorised the attack anyway. Said destroying the technology was worth the risk. Then Keane fired."

I leant against a bookcase, trying to absorb it.

"They sacrificed an entire neighbourhood to stop the technology falling into government hands? Our own government's hands?"

"It's grown worse since you left, Adam. Vane has us erasing visitors at twice the old rate. The official explanation is increased temporal intrusion, but..."

He shook his head.

"Something doesn't add up."

"They're not threats," I said, testing him.

Peter did not look surprised.

"I'm beginning to think the same. Before Keane shot the pilot, I could see inside the vessel through my scope. It held what looked like recording equipment and scientific instruments. I saw no weapons."

I wanted to tell him about the book, but I held back.

"Why has the elimination rate increased?"

"Vane says it is necessary to protect something he calls timeline integrity, but he won't explain further. Command is frightened of something."

Peter checked his watch.

"I have to go. If anyone sees us together, it will raise questions."

"Be careful, Pete."

"You too."

He hesitated.

"Your file is still marked for potential re-recruitment. Vane believes you'll return eventually."

I almost laughed.

"That isn't going to happen."

After Peter left, I wandered through Blackwell's without really seeing the books. By the time I returned to Bristol, I had made my decision.

It took less than a week to sell the little furniture I owned, close my bank accounts and pack everything important into one holdall and a backpack. The book stayed with me at all times, wrapped in cloth and tucked inside an inner compartment.

Standing in the empty flat, I looked around for the last time. I had spent six months hiding in plain sight, attempting to build an ordinary life while carrying what I knew. I could not continue.

Not while the Solihull death toll remained above 2,600 and other victims fought the lingering effects of the temporal discharge.

I had booked a one-way flight to Buenos Aires for that evening. South America seemed distant enough to buy me time while I worked out what to do next. I had learnt some Spanish during my years in the British Army, and Argentina had strong universities. Perhaps I could find someone there who could help me understand the book.

What mattered was putting distance between myself and the TSD, and between myself and the country where I had once killed for a living. I had believed I was protecting national security. In truth, I might have been helping to bury it.

As I locked the flat for the last time, I thought of the visitors I had killed over the years.

Were they all historians? Researchers attempting to record a past that their future had somehow lost?

How many scholars had I murdered because someone wanted to control the story?

Whatever secrets the book contained, I owed it to its original owner, and to all the others I had erased, to discover the truth.

Nearly two years later, the final page of my Argentine visa application lay on the desk of a cheap hostel room in Lima.

This would be my fourth country since vanishing. Ecuador, Colombia and Peru had each offered somewhere to remain for a while, but none had given me answers. South America had become both my hiding place and the ground on which I searched for someone capable of understanding the book I had carried across continents.

My new identity papers rested beside the application.

Thomas Reed, Irish citizen, freelance historical researcher.

The false documents were excellent. They had cost almost a third of my remaining money. The passport photograph showed a man I barely recognised, with a beard and hair far longer than I had ever worn during my TSD years.

My backpack stood open on the bed, its contents arranged so that I could leave at a moment's notice: clothes, toiletries, emergency cash in several local currencies, a compact laptop configured with strong security and, at the bottom, the book wrapped in cloth and sealed inside a waterproof bag.

After nearly two years on the move, I had learnt to travel lightly but remain prepared.

The dead ends had been countless. University lecturers had dismissed the text as a fabrication. Cryptographers had attempted conventional decoding methods and failed. Anthropologists had been unable to connect the language to any known human system of communication.

I had approached each of them cautiously, using stories about discovering the book in my grandfather's attic or buying it from an estate. I never showed anyone the whole volume, only selected pages, and I never remained in one place long enough to attract suspicion.

The following morning, I boarded a bus towards the Bolivian border, the first stage of my journey to Argentina. Mountains gave way to plains, and at length the route brought me to the vastness of Buenos Aires.

For the first time in months, I felt a measure of hope. The University of Buenos Aires had one of South America's most respected linguistics departments. If answers existed anywhere, they might exist there.

Spring had reached Buenos Aires by the time I secured a meeting with Dr Eleanor Whitcombe.

Her name had appeared repeatedly in academic journals devoted to extinct language patterns. She was a British expatriate who had built her career studying vanished systems of communication, and she was my best remaining lead.

The university campus was busy as I approached the linguistics building. Students sat on patches of grass between lectures, their voices forming a pleasant screen of noise that helped conceal my movements.

Years of caution had hardened into habit. I still watched for anyone following me, still identified exits and still chose seats with my back against a wall.

Dr Whitcombe's office door stood slightly ajar.

I knocked gently.

"Come in," she called. Her southern English accent had softened after years abroad, though its origins remained clear.

I entered a meticulously ordered office. Reference books filled neatly labelled shelves, papers had been arranged into precise stacks, and the desk held only the work currently occupying her attention.

Dr Whitcombe looked up from her computer and pushed her rectangular spectacles higher on her nose.

"Dr Whitcombe, I'm Thomas Reed. Thank you for agreeing to see me."

She stood and offered her hand.

"Please call me Eleanor. Your email mentioned an unusual text you were researching."

I nodded and removed a photocopied page from my folder. Experience had taught me never to bring the genuine book to an initial meeting.

"I encountered this during my research. The language doesn't correspond to any known classification system. I've consulted several experts, but none has been able to identify it."

Eleanor took the page and studied it with an intensity that stirred my hopes. Her eyes narrowed slightly as she followed the unfamiliar symbols with one finger.

"Where did you find this?" she asked without looking up.

"It was in a family collection," I replied, giving the lie I had rehearsed. "My grandfather was an amateur collector. I found it among his possessions after he died."

She made a noncommittal sound and continued examining the text.

After several minutes, she spoke.

"This is unusual. Its structure suggests a logographic system incorporating elements of syllabic writing. There is enough internal consistency to rule out a random invention."

She raised her eyes to mine.

"You said this was a single page. Is there more?"

"An entire book."

"And you are certain it isn't a constructed language? An elaborate coded journal, perhaps, or some sort of creative project?"

"That is what I'm trying to establish," I said carefully.

Eleanor's analytical gaze made me feel transparent.

"Mr Reed..."

"Thomas, please."

"Thomas, I deal with questions of academic integrity every day. Students plagiarise. Researchers advance claims that cannot be verified. Whatever this is, I need complete honesty about its provenance before I invest time in it."

I met her eyes and considered how much of the truth I could safely reveal.

"I can't tell you precisely how I obtained it. What I can say is that understanding this text may be more important than you can imagine."

She leant back, now studying me rather than the page.

"That gives me very little to work with."

"I know. But I can show you more of the contents. The book contains diagrams and illustrations alongside the text. They appear to depict historical events in a degree of detail that is difficult to explain."

Curiosity and disbelief struggled across her expression.

At last she sighed.

"Bring the book tomorrow. I'll examine it briefly. I promise nothing beyond that. If I suspect a forgery or a hoax, our discussion ends immediately."

"That's all I'm asking."

When I left her office and crossed the busy campus, it seemed that I had finally made progress. Nearly two years of searching had brought me to that moment.

Whether Eleanor Whitcombe would prove to be my breakthrough or merely another dead end remained uncertain.

Three days later, Eleanor's eyes widened as she carefully turned the pages of the book.

We were sitting in her private research laboratory rather than her office. It was a secure, windowless room reached with a keycard and offered considerably greater privacy. After her first examination, she had agreed to study the volume more closely.

"These illustrations," she murmured, indicating a detailed aerial depiction of what I had identified as the Battle of Waterloo. "The perspective is impossible. No one in the early nineteenth century could have produced this viewpoint."

"That was what first caught my attention," I said, watching her reactions. "There are dozens more like it throughout the book."

Eleanor took a magnifying glass from a desk drawer and bent over the text surrounding the illustration.

"The language itself is extraordinary. It has internal consistency and grammatical logic, but it does not fit any known linguistic family."

"Can you translate it?"

She looked up and adjusted her spectacles.

"Not immediately. Given enough time and the correct approach, perhaps. The diagrams offer contextual clues that we can use as anchors. If the illustrations genuinely depict the historical events you believe they do, we can cross-reference symbols placed near known people, objects and locations."

"How long would that take?"

"Months, not days," she said frankly. "I would also require secure access to the book for extended periods."

I hesitated. I had never willingly let the book out of my possession since taking it from the visitor beneath the loading gantry in the Royal Docks.

Eleanor seemed to recognise my reluctance.

"This laboratory has restricted access. Only my graduate assistant and I have keycards, and I can ensure that my assistant has no reason to enter while we are working. There are cameras, but I can have them disabled during our sessions on the grounds that the project requires confidentiality."

"You'd do that? Risk your academic reputation for something you can't verify?"

She pointed to the open volume.

"Look at this image of what appears to be aerial combat over ancient Mesopotamia. No one of that period could have created it with the means available to them. The language fascinates me, but the illustrations should not exist at all."

She looked directly at me.

"That makes this the most exciting project I have ever encountered."

I had to choose. Without Eleanor, I was unlikely to decipher the book. After nearly two years of searching, I had found no one better qualified to help. Her direct, disciplined manner also made me trust her.

"All right," I said at last. "But I have conditions. The book never leaves this laboratory. No photographs, scans or copies leave the room. I must be present during every research session."

Eleanor nodded.

"Agreed. I'll clear my timetable and concentrate on this. We can begin tomorrow morning."

Days became weeks, and weeks became months.

Eleanor and I established a routine. We met early each morning, before the campus grew busy. I collected the book from its hiding place in a rented safe-deposit box at a nearby bank and carried it to the laboratory. Eleanor worked on it until evening, after which I returned it to secure storage.

She attacked the translation like a scientist. She built a database of symbols and compared them with the illustrations and with known historical events. Slowly, patterns emerged. Certain symbols appeared consistently beside weapons, while others clustered around maps, terrain or troop movements.

I rented a small flat near the university and paid six months in advance in cash. My days passed in Eleanor's laboratory, watching her work and assisting where I could. At night I remained alert, searching news reports for signs of TSD activity, moving my money between hiding places and rehearsing the escape plans that had kept me alive.

Three months into the work, Eleanor achieved her first significant breakthrough.

"Look at this," she said, pointing to a sequence of symbols repeated throughout the book. "I believe this is a date marker. If I am right, the material is arranged chronologically and documents events in historical order."

She showed me her notes, in which she had connected symbols to periods suggested by the accompanying illustrations.

"This section clearly concerns the English Civil War. These symbols appear nowhere in the earlier material, but become common afterwards. They probably represent concepts or technologies that did not previously exist."

Her method was working.

By the fourth month, we understood the book's basic organisational structure. By the fifth, Eleanor could recognise recurring phrases and propose their likely meanings.

The text did more than describe battles. It analysed strategy, outcomes and historical significance.

Through all of this, Eleanor never asked me directly where the book had come from. Yet I sometimes caught her studying me when she thought I was not looking.

The decisive breakthrough came during our sixth month.

I arrived at the laboratory to find Eleanor already there. Her eyes were red from lack of sleep, but her face was alive with excitement.

"I've got it," she said before I could offer our usual morning greeting. "I finally understand what we're looking at."

She led me to her desk. Pages of notes lay spread beside printed historical maps.

"Read these sections," she said, indicating several passages she had translated in her precise handwriting. "This isn't merely a record of history. It is an analysis written from a perspective far removed from the events themselves."

I leant closer and read her notes.

The conflict known as the Second World War represents a critical juncture in humanity's development of mechanised warfare. Earlier scholarly reconstructions based upon fragmentary records failed to capture the tactical importance of weather conditions during the Normandy landings.

"And this passage," Eleanor said, turning to another page.

The value of this direct observational record cannot be overstated, as the Great Data Collapse of 2187 left substantial gaps in the historical understanding of pre-modern combat techniques.

My pulse quickened.

"2187?"

Eleanor nodded, her expression now grave.

"The text contains repeated references to events in the twenty-third century. Whoever wrote this was looking back upon our period from the future."

She paused and watched my reaction.

"Thomas, this is not merely a book about wars. It is a historical document from the future."

I lowered myself heavily into the chair beside her desk.

The visitors, the people I had been trained to hunt and erase, were not spies or enemies. They were scholars. Historians recording our present for a future in which that knowledge had somehow been lost.

"There's more," Eleanor said, more gently. "From what I have translated, the authors are conducting direct observational research because of something called the Great Data Collapse. It appears to have caused an immense loss of historical records in their own era. They are not altering events. They are witnessing and recording them because their historical archive is incomplete."

My hands trembled as I stared at the pages before me.

All those visitors I had erased with a single pull of the trigger. Each had been a researcher, a scholar trying to preserve human knowledge that might otherwise disappear.

"The TSD knows," I said, more to myself than to Eleanor. "They must know what the visitors really are."

She frowned.

"The TSD? What is that?"

I looked at her and realised what I had revealed. Yet after six months of working together, perhaps I owed her a measure of honesty.

"The Temporal Security Directorate. A covert British government body I used to work for. Its precise relationship with the Ministry of Defence and the intelligence services is deliberately obscured."

I drew a deep breath.

"They are the people hunting the historians who wrote this book."

Understanding settled across her face.

"That is why you've been so secretive. Why you needed the text translated so badly."

It was not a question.

"Yes."

I looked down at the volume, at the meticulous record created by people who had travelled through time to observe history directly.

People I had helped erase.

"I was told they threatened national security. That they had come to interfere with our timeline or gather intelligence that could harm the country."

"But they're historians," Eleanor said, academic outrage sharpening her voice. "They are preserving knowledge that would otherwise be lost."

"And I killed them for it."

The words felt like stones in my mouth.

Eleanor remained silent for a while, considering everything I had told her.

At last she asked, "What will you do now that you know the truth?"

I looked at the book and thought of the labour contained within it. Not only our six months of translation, but the years spent by visitors documenting human history and compiling records they had never intended to leave behind in our century.

I had carried out 31 confirmed eliminations for the TSD.

How many of those researchers had I killed myself? How many gaps had I opened in the future's knowledge with my nullifier pistol?

"I don't know yet," I admitted. "But I cannot allow the TSD to continue hunting them. I cannot let more historians die because someone wants to control the narrative."

Eleanor gathered her translation notes and arranged them methodically while she thought.

"We must be careful about what we do next. If this Directorate has knowingly murdered historical researchers from the future, it will not hesitate to silence us for discovering the truth."

"You don't have to become involved any further," I said. "This could be dangerous. My former colleagues have resources and training. They will not stop simply because we know what they are doing."

Eleanor gave me a look of determination I had not seen before.

"You brought me a linguistic puzzle that may also be the most important historical document ever discovered. Do you honestly think I am going to walk away now?"

A faint smile reached my face.

"I suppose not."

"Good. Then we need a plan."

She tapped one finger against the translation notes.

"We have only begun to understand what this volume contains. There may be information about when and where these historians appear. We might find patterns that allow us to reach them before your former Directorate does."

My mind was already turning over the possibilities.

"You're right. If we can predict their arrival points, perhaps we can warn them. Perhaps we can help them finish their observations without being detected."

For the first time in nearly two years, perhaps for the first time since leaving the TSD, I felt that I had a purpose beyond remaining alive.

I had once served a system that murdered people for trying to preserve the truth. Now I had an opportunity to protect that truth instead.

"Let's get back to work," I said, drawing my chair closer to the desk. "There is still a great deal to translate."

Eleanor nodded. Her academic concentration returned as she spread out her notes.

Together we bent over the Book of Wars and searched for patterns that might help preserve the future's connection to its past.

Three months later, I sat before a battered public computer in a noisy Santiago locutorio. Teenagers played online games around me while tourists held video calls with relatives thousands of kilometres away. Between translation sessions with Eleanor, I had spent weeks building the site I was now preparing to launch.

It was an onion service accessed through an anonymity network. It contained everything I had learnt about the TSD, the visitors and their true purpose as historians.

The decision to release the information had not been easy. After our breakthrough, Eleanor and I had spent days debating the risks. In the end, we agreed that the truth had to reach people who might help protect the scholars travelling into our time.

More than that, I hoped to find others like me: people capable of sensing a visitor's arrival.

I looked around the locutorio and checked for anyone paying too much attention to my screen. When I saw no obvious watcher, I uploaded the final material and activated the service.

A small green confirmation message appeared. It felt absurdly ordinary in comparison with the risk I had taken.

I removed the local traces of my session, paid for the computer and left.

Outside, Santiago's evening traffic filled the streets. I kept my head down and walked roughly a kilometre back to my flat, taking a different route from the one I normally used.

The city had been my home for three months, ever since Eleanor and I agreed that it would be safer to separate after finishing translations of the book's central sections. She had returned to Buenos Aires with secured copies of our translation notes. I had travelled west into Chile with the Book of Wars itself.

Two nights later, I was adding further translations to the site when my mobile phone vibrated.

The message came from my landlady.

Men in suits asking about you. Civil Service security credentials.

Adrenaline struck me like cold water.

I shut down the laptop immediately and pulled my emergency bag from beneath the bed.

Within 90 seconds, the book was secured in my backpack beside the laptop, cash reserves and essential documents. The TSD had found me more quickly than I had expected.

Footsteps sounded in the stairwell as I slipped through the window and onto the fire escape. The metal groaned under my weight but held while I descended into the narrow alley behind the building.

My feet had scarcely touched the ground when I heard my flat door splinter three floors above.

I pulled my cap lower and walked towards the street. I did not run. Running attracted notice.

I merged with a group of young professionals heading out for dinner and put about 700 metres between myself and the building before entering a 24-hour coach terminal.

I bought a cash ticket for the first northbound service. Three hours later, I was crossing into Peru.

The small hotel room in Lima had walls so thin that I could hear every conversation in the corridor. I sat on the edge of the bed with my laptop open but disconnected from the internet. It would remain offline until I found a public network I could use briefly without tying the activity to my accommodation.

Four days had passed since my escape from Santiago.

I had abandoned the Thomas Reed identity. I was now travelling as Owen Clarke, an Irish technical translator, using another carefully prepared set of documents.

The Book of Wars never left my reach. It remained either in my backpack or, while I slept, beneath the mattress directly under me.

I could not stop thinking about what had caused the raid.

Had I been careless with my internet use? Had Eleanor been compromised? Had the TSD identified the onion service through an operational mistake despite the precautions I had taken?

Whatever the answer, I would have to be more careful.

The next morning, I found an internet cafe in a tourist district and checked the encrypted email account linked to the site.

There were 17 messages.

Most came from sceptics or conspiracy theorists, but three expressed serious interest and described inexplicable incidents resembling visitor appearances. None mentioned a sensory ability like mine.

I spent an hour replying to those three people. I asked specific questions that only someone who had genuinely encountered a visitor could answer. Then I removed the local browsing data, paid in cash and left.

For the next two weeks, I continued north through Peru, never remaining anywhere for more than two nights. Coach stations, cheap hotels and crowded markets became the landscape of my daily life.

I checked messages whenever I could, maintained the website and continued adding translations from sections of the book that Eleanor and I had only partially deciphered. During quiet evenings in anonymous hotel rooms, I began to notice something in the visitors' documentation that we had missed during our initial work. There was a pattern to the historical events they chose to observe. It was not random.

The future historians seemed to follow a methodical timeline, documenting major conflicts chronologically while also appearing at the sites of minor skirmishes and unrecorded military operations. I began tracking those patterns, creating a handwritten log of dates and locations mentioned in the book. If the visitors followed consistent protocols, it might be possible to predict where and when they would appear next. That knowledge could prove invaluable, both for avoiding the TSD and, perhaps, making contact with the visitors themselves.

By the time I reached Bogota, Colombia, my notebook contained dozens of potential appearance sites based on battle anniversaries and the locations of conflicts absent from conventional histories. I was particularly interested in a pattern of observations connected to classified Cold War operations, events that overlapped with my own military background and knowledge of covert British interventions.

I arrived in Cartagena amid oppressive coastal heat and crowds of tourists. I had chosen it for precisely those reasons. It was easy to disappear there, with several ways out and reliable internet access for foreign travellers. The colonial buildings created a maze of narrow streets and blind corners that made surveillance difficult, while the constant movement of visitors meant that unfamiliar faces attracted little notice.

I sat outside a cafe, drinking coffee and using its Wi-Fi through a secured connection. Three months had passed since my escape from Santiago.

The website had grown into a small but dedicated community of people sharing experiences of temporal anomalies and unidentified observers. I moderated it carefully, alert to TSD officers attempting to infiltrate the group. My email notification sounded softly. I opened the message expecting another account of strange atmospheric changes or unexplained figures at historical sites.

Instead, I found something that made me sit upright.

I know what you are. I feel them too. The pressure change. The electric tingle at the base of the skull.

It has happened since I was a child. I found others like us. We need to meet.

Verification code: Temporal Sensitive Type Three.

The message contained no name or location, only a protocol for establishing encrypted contact. My fingers hovered over the keyboard. This could be exactly what I had been searching for: another person with my ability to sense the visitors.

It could also be a TSD trap.

The verification code held my attention. Temporal Sensitive Type Three was TSD classification terminology, something I had never mentioned on the website. Either this person had a connection to the Directorate, or they had encountered the same classification system independently, which suggested that other organisations might also be tracking temporal phenomena.

I spent the next three days establishing secure communication channels and requesting specific verification details that would be difficult for the TSD to fabricate. The replies described sensations that matched mine too precisely to be guesswork: the pressure behind the eyes, the tingling exactly 24 seconds before an arrival and the lingering metallic taste afterwards. I had never shared any of those details publicly.

Finally satisfied that it was not a trap, I proposed a meeting in Chapultepec Park in Mexico City, near the history museum. It offered several escape routes and crowds dense enough to frustrate surveillance, yet enough open ground to identify an obvious threat.

The response arrived within hours.

Eight days. 12:00. By the fountain. I will find you.

That night, I booked a series of coach journeys north through Colombia towards Panama, followed by flights under different identities to Guatemala and, finally, Mexico. As I packed my few possessions, I realised I felt something I had not experienced since discovering the truth about the visitors.

Hope.

If there were others who shared my ability, who could sense the visitors and understood what they truly were, perhaps we could create a network to protect them. Perhaps we could ensure that the future's connection to its past remained intact despite the TSD's efforts to control the historical record.

I tucked the Book of Wars securely into my rucksack and checked out before sunrise. I was heading for Mexico City and, perhaps, an ally in this lonely fight for historical truth.

I circled the fountain in Chapultepec Park for the third time, pretending to study a tourist map while checking for anyone watching me. It was seven minutes past 12:00. My contact was late, or she had seen something that had frightened her away.

After eight days of cautious travel through Central America, two changes of identity and five changes of transport, I had reached Mexico City only to face the possibility of another dead end.

A woman passed me, then stopped abruptly about three metres away. She was around thirty, with long black hair tied into a neat plait and alert dark eyes that swept quickly across the area. Nothing else about her seemed unusual. She wore practical clothes in neutral colours, carried a small rucksack and held herself with the relaxed posture of any tourist enjoying the park.

Yet the way she checked our surroundings reminded me of myself. I had developed the same habits.

She did not approach me directly. Instead, she sat on a bench from which she could watch both me and the surrounding paths. Our eyes met briefly. She inclined her head towards a street-food vendor selling esquites farther along the path, then stood and walked towards him.

I waited thirty seconds before following, keeping my distance and watching her move through the crowd.

If this was a TSD trap, several officers would be positioned throughout the park. I studied every face I passed, looking for the disciplined watchfulness of field personnel. I saw nothing suspicious.

The woman bought a cup of esquites and continued towards the museum. I followed her past the entrance, across a courtyard and into a dim corridor linking two exhibition halls. There she stopped and turned.

"You're Adam Mercer," she said. It was a statement, not a question.

I neither confirmed nor denied it. My expression remained neutral.

"My name is Priya Nair. I sent the message about sensing them."

"Verification code?" I asked, still keeping my distance.

"Temporal Sensitive Type Three," she replied. "The pressure builds behind your eyes first, doesn't it? Then the tingling starts at the base of your skull exactly 24 seconds before they appear."

The details matched my experience precisely. I had never published them online.

"How did you find me?" I asked.

"Your website. The way you described the visitors and their appearances at historical sites matched my observations too closely to be coincidence." She glanced along the empty corridor. "This isn't the place for the conversation. I have a flat in Roma Norte with secure communications. We can talk there."

I considered my options. Meeting in public was safer than following a stranger to a private address. But if Priya genuinely possessed the same ability, the information she held might justify the risk.

"Lead the way," I said. "But we take precautions."

Priya nodded at once. "Three separate changes of transport. No direct route. You choose the final leg, so I don't know our destination until we arrive."

She spoke my language: the language of someone who understood security not from a manual, but from necessity.

Two hours and four changes of transport later, one more than Priya had proposed, we reached her building on a quiet residential street. Her security arrangements impressed me. The flat had two entry points, unobstructed views of every approach and windows opening on to a rear fire escape. Signal-blocking curtains covered the glass, and a white-noise generator murmured in the background.

"Military?" I asked, recognising the systematic precautions.

"No. Self-taught."

Priya moved through the flat with practised efficiency, checking security feeds on a tablet before putting it aside.

"When you spend your life seeing things no one else can see, you learn to be careful."

The flat was sparsely furnished: a table with two chairs, a sofa that looked barely used, and walls covered with maps, photographs and handwritten notes linked by coloured thread. One entire section was devoted to a timeline spanning decades.

"How long have you been tracking them?" I asked, studying the meticulous display.

"Since I was nineteen. That was when I realised what I sensed wasn't merely headaches or anxiety." Priya took two bottles of water from a small fridge and handed one to me. "But I've had the ability since childhood. The first time I remember feeling it, I was eight. My family were visiting Battle Abbey."

The reference sent a jolt through me. The Book of Wars contained an impossibly detailed account of the Battle of Hastings, and its depiction of Senlac Hill had been among the first things to make me doubt the TSD's story about the visitors.

"What happened there?"

"Nothing dramatic. I felt strange, as though the air pressure had changed and everything had become electrically charged. My mother thought I was falling ill. Later that day, I saw a man taking notes near Senlac Hill. He didn't look like the other visitors. He was too intent, too focused.

"He noticed me watching and seemed surprised. Almost frightened. Then he walked into a wooded area and never came out."

She drank some water.

"I went looking for him. I found nothing except disturbed leaves and a peculiar smell, like ozone."

Her experience mirrored countless operations I had undertaken for the TSD. The historian she had seen as a child had probably been murdered by people like me within hours of his arrival.

"When did you realise that other people could sense them?" I asked.

"Two years ago. I found an online forum where people described similar experiences: pressure changes, electrical sensations and observers who appeared out of place at historical sites. Most contributors were dismissed as conspiracy theorists. But three of us recognised that we were experiencing the same phenomenon."

Priya went to the research wall.

"We began comparing notes and tracking patterns. One of us lives in Toronto, another in Buenos Aires. You're the fourth person we've found."

"And the others can sense the visitors as we do?"

Priya nodded. "The same symptoms and the same timing. Exactly 24 seconds of warning before a visitor arrives. We've been trying to understand why we have the ability and how we might use it."

I put down my water and reached for my rucksack.

"I think I can help with that."

I took out the book and placed it on the table. Priya stared as I unwrapped its protective cloth.

"What is that?"

"They call it the Book of Wars. It belongs to the visitors." I opened it to the section Eleanor and I had partially translated. "They're historians, Priya. They're from the twenty-third century."

For the next two hours, I told her everything: the TSD, my role as an elimination specialist, my 31 murders, my discovery of the book and Eleanor's breakthrough in deciphering it. I explained the Great Data Collapse of 2187 and how the visitors travelled into the past to reconstruct knowledge that had been lost. They observed and recorded, but they could not intervene or change established events.

Priya listened without interrupting, occasionally comparing my account with material on her wall. When I finished, she approached the timeline and indicated a sequence of marked dates.

"These are confirmed visitor sightings. Red pins mark those I sensed myself. Blue ones came from my contacts." Her finger followed the pattern across years of documentation. "They aren't random. The focus is clearly on military conflicts and their anniversaries, but not only famous battles. They also appear at the sites of classified operations and covert actions that never entered the official histories."

I joined her at the wall. Her method differed from mine, but it had led her to the same conclusion. I had concentrated on the contents of the book; Priya had mapped the appearances of the historians themselves.

"Look at the frequency," she said, pointing to clusters of pins. "Appearances increased sharply from 2016, with major spikes roughly every twenty months. If the pattern continues, we're entering another spike now."

"That matches what the book suggests. They appear to work in research cycles, documenting events chronologically while several teams operate at once."

Priya turned towards me, her expression intent.

"If they're historians trying to record what actually happened, why is your former organisation so determined to stop them?"

"Control of the narrative," I said. "The TSD and whoever directs it don't want certain operations documented, even for generations that haven't been born. They use national security as cover for historical revisionism."

Priya nodded as though I had confirmed a suspicion she had carried for years.

"I've been tracking the government response as well."

She took a folder from beneath a stack of papers and spread its contents across the table.

"TSD officers reach roughly 72 per cent of confirmed visitor sites within ninety minutes of an appearance."

"Which suggests a detection system," I said. "The Directorate has technology that alerts it to temporal disturbances."

"But they're nearly always too late," Priya replied. "Unless they have someone like us."

The realisation struck me with old, familiar nausea. That was why the TSD had recruited me. People with our ability gave it advance warning.

Priya produced another document, a printed email whose Civil Service security headers remained partly visible.

"Three weeks ago, this arrived through one of my secured channels. A former analyst leaked information about a TSD operation called Project Sentinel. They're actively searching for people with our ability."

I read the document and felt sick. Project Sentinel was not merely recruiting temporal sensitives. It was studying the biological markers associated with our perception, trying to build technology that could do naturally what Priya and I did.

"Where did you get this?"

"My contact in Buenos Aires has government connections."

Priya took the paper back.

"There's something else you need to know. They've traced activity associated with your onion-service site to Mexico. You've been compromised."

I considered what that meant. If the TSD had followed me to Mexico, it would already have deployed a team. The question was not whether they were coming, but when they would arrive.

"Who would they send?" Priya asked.

"Peter Shaw," I said without hesitation. "He worked beside me for years. He knows how I think and how I move."

I began wrapping the book and returning it to my rucksack.

"We need to leave. We can continue this somewhere else."

Priya caught my arm.

"Wait. Before we go, there's something in my research you need to see."

She went to her computer and displayed a series of satellite images of central London and Westminster. Beside them, she opened a calendar with several dates circled.

"These are locations connected to classified operations conducted during the Cold War: secure premises, interrogations and covert meetings between British officials and foreign agents. Do you notice anything?"

I studied the images and the dates.

"They all correspond to visitor appearances on your timeline."

"Yes. But look at the pattern in Westminster specifically."

She indicated a cluster of red pins around dates in June.

"Three years ago, six visitors appeared within eight hundred metres of Victoria Memorial. Every appearance fell on the anniversary of something called Operation Nightjar."

The name struck me like a blow. Operation Nightjar was a covert British intervention conducted during the 1980s. I had learnt of it during my TSD training, though most of its details remained sealed decades later.

"The anniversary is next week," Priya continued. "Based on the three-year cycle I've documented, there is an 89 per cent probability that a visitor will appear in the same area to continue recording Nightjar."

I understood immediately what she was proposing.

"You want to intercept the visitor. Make contact before the TSD arrives."

Priya nodded.

"If these people are historians trying to recover erased events, helping them could be the most important thing either of us ever does."

I considered the risks. Returning to Britain meant walking back into the country where the TSD exercised its greatest influence. Westminster would be heavily watched, especially around sensitive sites. If Peter was tracking me, he would know my training and methods because they had once been his as well.

But the possibility of making direct contact with a visitor, of preserving historical truth instead of erasing it, was worth the danger.

"Central London is precisely where the TSD would expect me not to go," I said. "That gives us a small element of surprise."

"I have clean identities and prepared documents," Priya said. "We can use indirect routes and avoid the most obvious checks. It won't eliminate the risk, but it will reduce it. If we move quickly, we can be in position before your former colleague reaches Mexico City and realises he's lost us."

I looked once more at her wall, taking in the years of careful work she had completed alone, driven by the same questions that had haunted me since I found the book. Her methods differed from mine, but they complemented them.

Together, we might succeed where I had failed alone.

"When do we leave?" I asked.

Priya began removing the most important parts of her research.

"Two hours. Take only what you cannot abandon."

As she dismantled years of work and locked the crucial documents in a secure case, I watched her with new respect. I had spent roughly two years running, hiding and searching. Priya had spent far longer tracking the same mystery from another direction. Now our paths had converged around a shared purpose: protecting the connection between the future and its past.

The Westminster operation would be dangerous, perhaps the most dangerous thing I had attempted since leaving the TSD. But for the first time since discovering the book, I would not be working alone.

That knowledge brought comfort and anxiety in equal measure. More than my life would now be at risk.

I touched the book inside my rucksack. The historians who created it had crossed time to document the truth. The least I could do was cross borders to help them complete their work.

I stood near Victoria Memorial, pretending to photograph The Mall while examining the crowds for anyone out of place. Priya and I had arrived in London three days earlier by separate, indirect routes, using the clean identities and prepared documents she had arranged. TSD surveillance was covert rather than universal, and its reach was imperfect. That had allowed me to enter Britain, though it did not mean I had escaped notice.

My identity named me as Martin Hale, a secondary-school history teacher from Devon enjoying a summer visit to London. The false glasses and lighter hair would not defeat facial-recognition systems for long, but they might buy me a few vital seconds if I encountered the TSD.

We had prepared meticulously. We booked rooms at different hotels on opposite sides of central London, paid in cash where possible and avoided security cameras without behaving so conspicuously that we drew attention. We bought prepaid mobile phones used only for short coded messages. We memorised several escape routes from Westminster, Trafalgar Square and the West End. Most importantly, we studied the appearance patterns Priya had assembled over years of observation.

The anniversary of Operation Nightjar had brought us there.

According to her research, the covert intervention of the 1980s had attracted future historians three times during the previous decade. They had always appeared in the same part of central London, within several hundred metres of Victoria Memorial. If the pattern held, another researcher would arrive that day to continue documenting what the British state had tried to erase from history.

Tourists streamed along The Mall beneath the fierce early-June sun. Priya remained in position farther east, her dark hair tucked beneath a cap and sunglasses concealing her eyes. We had been there since dawn, taking turns to circle the area and watching for both a visitor and any sign of the TSD.

My mobile vibrated with a message from her.

Secondary-school group near north side. Guide looks wrong.

I turned casually towards a group of pupils gathered around a man wearing a guide's badge. At that distance he seemed ordinary enough: light trousers, a polo shirt and a clipboard. But his posture was too rigid and his attention too evenly divided between the group and the surrounding crowd.

I replied: Noted. Continuing circuit.

The morning stretched into afternoon. The heat intensified, driving some tourists towards shade, cafes and air-conditioned museums. I remained in place, drinking sparingly from a bottle of water and playing the role of a history enthusiast too absorbed to leave.

Then it happened.

The air pressure changed subtly. No ordinary person would have noticed, but I recognised it at once. A tingling sensation began at the base of my skull and spread upwards.

Twenty-four seconds.

That was how long remained before the visitor arrived.

I touched my ear twice, our signal to Priya, then turned slowly and allowed the sensation to guide me towards the disturbance.

Eighteen seconds.

The pressure strengthened as I walked at an unhurried pace towards an overlooked section of the memorial. Tourists posed for photographs. A family debated where to have lunch. Two security officers chatted near the edge of the crowd.

Ten seconds.

I saw Priya approaching from the other direction. Her pace was measured, her head inclined slightly to keep her face away from cameras.

Five seconds.

The tingling reached its peak and the hairs on my arms lifted. I had felt it again and again while working for the TSD, every warning followed by my pursuit and murder of the person I sensed.

Today would be different. Today we would make contact.

The visitor appeared precisely where my senses had led me. He was a man in his fifties, with a digital camera hanging from his neck. He wore light trousers and a blue shirt, and to most observers he would have looked entirely ordinary. I noticed the signs: clothing that seemed new yet had been selected to blend in, posture that was fractionally too perfect, and the way he photographed particular angles of the memorial instead of composing the usual tourist pictures.

He moved towards a section bearing no famous inscription or obvious feature. Opening what seemed to be a guidebook, he used it to conceal a small instrument resembling a mobile phone, though an unusual line of sensors ran along one edge.

Priya and I approached from different angles, slowly enough not to alarm him. We needed to establish contact quickly but carefully. If we frightened him, he might withdraw before we could explain ourselves.

That was when I saw them.

Three men in light summer clothes were spaced around the memorial. Their casual poses could not disguise the constant movement of their eyes or the minute earpieces they wore.

TSD field officers.

My stomach tightened. Had they traced us from Mexico after all, or had they independently identified the pattern in the appearances?

I caught Priya's eye and tapped my wrist twice, signalling the TSD's presence. She gave the smallest nod and continued towards the visitor, adjusting her course to resemble that of an aimless tourist.

A second look revealed a fourth officer approaching along The Mall.

Then, emerging from a knot of tourists, I saw a face I recognised instantly.

Peter Shaw, my former colleague, moved towards the visitor with studied nonchalance.

We had run out of time. I abandoned subtlety and walked directly to the historian.

The man looked up as I approached. For an instant fear crossed his face, the same fear I had seen in countless visitors before killing them.

"I'm not with them," I said quietly when I reached him, gesturing as though asking him to take my photograph. "I know what you are. I'm trying to help."

His fear gave way to confusion, then wary interest.

"You are approaching me directly. That is unusual."

"I used to work for the people hunting you," I said, positioning myself to obstruct the approaching officers' view. "But I know the truth now. You're historians, not infiltrators."

His eyes widened slightly.

"You're Adam Mercer."

The sound of my real name startled me.

"How do you know that?"

"Your elimination record is well documented in our time," he said, barely above a whisper.

His gaze moved past me. He had seen the approaching officers.

"You have killed 31 of our researchers."

The number was not new to me. It was the total recorded in my own files, but hearing it from one of the people I had hunted stripped away the Directorate's language. Thirty-one scholars had crossed centuries to preserve the truth, and I had collapsed their bodies into nothing.

My throat tightened.

"I'm trying to make it right," I said. "We need to get you away from here. TSD officers are closing in."

The visitor shut down his instrument and slipped it into his pocket.

"It is too late for that, but not for this."

He pressed a metallic disc into my palm. It was roughly the size of an old 50-pence piece and had a peculiar, finely textured surface.

"Find the others," he whispered. "We have much to share."

Before I could ask what he meant, a loud group of teenagers passed between us. When they moved on, the historian was already walking away, merging with a tour group heading along The Mall.

I tried to signal Priya but saw Peter instead. He stood about five metres away, watching me without expression.

Our eyes met. We had once worked side by side. Now we occupied opposite sides of a struggle neither of us had understood when we joined the TSD.

"Run," I mouthed to Priya, whom I could see at the edge of my vision.

She vanished into the crowd as planned. We had established rules for exactly this situation: separate, leave by different routes and meet at the emergency rendezvous if we escaped.

I closed my hand around the disc and moved quickly towards Trafalgar Square. I did not run. Running attracted attention. Instead, I walked briskly through the crowd, aiming for Charing Cross Underground station.

Behind me, I heard clipped fragments of the TSD team's communications as they followed. They were professionals, spreading out to block escape routes while maintaining the appearance of tourists and security staff.

I passed into Whitehall with a group of schoolchildren, using them as cover. Trafalgar Square lay ahead. A glance behind showed two officers maintaining their distance while steadily closing.

I increased my pace slightly as the pavement became more crowded. Then I saw another officer stationed near the most direct entrance to Charing Cross, examining everyone approaching.

They knew I would try the Underground.

I changed direction and crossed Trafalgar Square towards the National Gallery. If I could pass through the building and reach another entrance to the station before they adjusted their positions, I might gain enough time.

The square grew denser nearer the gallery. Good. More people meant more cover.

I entered the National Gallery through the main doors and moved quickly through the entrance hall, aiming for a route that would return me to the street nearer another Charing Cross entrance. The cool air was a relief after the June heat. I passed paintings and sculptures at a pace that was purposeful but not quite hurried enough to draw attention. A security officer looked at me, then returned his attention to a group of pupils sketching before a large canvas.

I left the gallery and continued across Trafalgar Square. I slipped the metallic disc into my pocket without examining it. If I escaped, there would be time for that later.

The entrance to Charing Cross station appeared ahead. I looked behind me. No one was visible. Perhaps I had lost them inside the gallery.

I hurried down the escalator, tapped through the barriers with a contactless card and reached the northbound Bakerloo line platform as a train arrived. The timing was perfect. I boarded a middle carriage with several connecting doors and, as the train pulled away, looked back at the platform.

Peter was running towards it, two other officers behind him.

I moved through the connecting doors into the next carriage, then the next, putting as much distance as possible between myself and the place where Peter had seen me board.

At Piccadilly Circus, I left the train with the crowd and followed the signs to the Piccadilly line. If I changed there, I might lose anyone tracking me through the network.

I descended towards the westbound platform among commuters and tourists. A train was already boarding. I stepped inside and took a position near the doors where I could see the platform.

The warning tone began. As the doors prepared to close, I saw Peter and another officer emerge from the passage, searching the crowd.

Peter's eyes met mine through the window just as the doors shut. His expression held neither triumph nor anger, but something more complicated. Something almost like regret.

The train started to move. For a moment, I thought I had escaped.

Then the emergency brake engaged with a shriek of metal. The lights flickered, and passengers murmured in confusion as the train stopped only metres beyond the platform.

"Ladies and gentlemen," an announcement said, "we are being held briefly due to a security incident. Please remain calm and stay on the train."

I knew what it meant. The TSD possessed enough influence to halt an Underground train.

They had trapped me inside a metal tube with few exits. The passengers looked around in bewilderment as the train remained motionless. I considered forcing the emergency door between carriages, but doing so would draw instant attention. Waiting for them meant surrendering any remaining advantage.

Before I could decide, the doors at both ends of the carriage opened. Peter entered from one direction and another officer from the other. Neither displayed a weapon, but their controlled movements made their intention clear. They knew I had nowhere to go.

Peter approached slowly, keeping his hands visible.

"Martin," he said, "security needs to speak to you about an incident near the memorial."

The other passengers watched with mild curiosity but little concern. To them, this looked like an ordinary intervention by security officers. Perhaps I had crossed a barrier or photographed something restricted.

I knew better. This was the end of my freedom and perhaps my life.

"I left my bag," I said, cooperating with the fiction while searching for an escape. "May I go back for it?"

"We have your bag," Peter replied smoothly. "Come with us and we can resolve this quickly."

A third officer appeared beside the carriage doors, sealing the remaining exit.

I considered fighting my way free. My training was comparable to theirs, but civilians would be injured in the confined carriage.

That was not who I wanted to be any longer.

"Fine," I said.

Peter came nearer and lowered his voice so only I could hear.

"Don't make this harder than it needs to be, Adam."

As he took my arm, the historian's disc pressed against my leg through my pocket. Whatever information it carried, whatever connection it offered to the other researchers, I could not allow the TSD to take it.

I stumbled against Peter and used the movement to slip my hand into my pocket, transfer the disc down the inside of my trouser leg and lodge it beneath my sock. They would search me, but they might overlook it there.

"Sorry," I muttered as I straightened.

Peter's eyes narrowed, but he said nothing. He guided me from the train while the other officers formed a loose cordon beside and behind me, controlling my movements and blocking every plausible escape.

When we emerged from the Underground into the bright afternoon, an unmarked black Range Rover with tinted windows waited at the kerb. Its registration bore nothing distinctive or overtly official.

The rear door opened.

"Get in," Peter said, professional but not unkind.

I looked once more across the London streets, wondering whether Priya had escaped and whether she would reach our emergency meeting point in Brighton, at the cafe near the Sea Life centre and seafront. Then I ducked into the vehicle. The door closed behind me with a solid thud.

As the Range Rover pulled into traffic, I thought of the visitor's disc concealed at my ankle. I had to protect it at any cost. It was my only connection to the others.

I sat in silence as the tinted vehicle carried us out of London. Peter faced me without expression while two officers sat on either side.

No one spoke during the journey into the Surrey Hills. We passed through a sequence of concealed security checkpoints, each more stringent than the last. Armed guards examined Civil Service security credentials and searched the vehicle before allowing us to continue towards an unremarkable grey building hidden among the trees.

"Welcome back," Peter said as the Range Rover stopped at a rear entrance.

The TSD facility looked exactly as I remembered it: deliberately plain outside, concealing the machinery within. Two years had passed since I walked away and submitted my resignation, yet nothing appeared to have changed.

The officers escorted me through security doors and along the same beige corridors. We passed the operations centre where I had received my assignments and the debriefing rooms where I had reported each successful elimination.

In the administrative wing, Peter dismissed the other officers.

"Just you and me from here," he said, leading me towards the director's office. "Tell him what he wants to know, Adam."

Before I could reply, Director Sir Malcolm Vane opened his door. His steel-grey hair was immaculately trimmed, and his dark suit looked freshly pressed, as though he had been awaiting important company.

"Adam," he said in his customary voice of command. "Come in."

Peter remained outside while Vane closed the door behind us.

The office was as austere as I remembered: a large desk, a window overlooking the woodland and no personal photographs or ornaments. A Union flag stood in one corner, beside security monitors showing different parts of the facility.

"Sit," Vane ordered, indicating a chair across from his desk.

I noticed the unused restraint fittings on its arms as I lowered myself into it. Standard procedure for a high-value interrogation.

Vane studied me for several seconds.

"Two years," he said at last. "Two years of resources spent tracking you across continents. Was it worth it?"

I remained silent. The question was rhetorical.

He opened a folder on his desk.

"Adam Mercer. Former British Army special forces. Recruited to the Temporal Security Directorate five years ago. Thirty-one confirmed eliminations of temporal visitors. Resigned without warning two years ago and disappeared."

He looked up.

"Then you surfaced in South America, meeting linguistic specialists, moving through Chile, Peru and Colombia, operating an onion-service site through an anonymity network, contacting other Sensitives and, finally, approaching a Visitor directly on British soil."

He closed the folder.

"I am curious about your motivation."

I decided to answer plainly.

"I know what they really are."

Vane's expression did not change. "And what might that be?"

"They're not infiltrators or threats. They're historians from a future that has lost its past. They're here to document events, not change them."

I watched carefully for his reaction. Surprise, denial, perhaps anger at what he might regard as my delusion. Instead, Vane leant back in his chair, entirely unfazed.

"Of course we know what they are," he said matter-of-factly. "That is precisely why they're dangerous."

The simplicity of the admission stunned me into silence. All this time, I had believed I had uncovered a truth the TSD did not know, or refused to acknowledge.

"You knew?" I managed. "All along?"

"From the beginning," Vane said. "The first visitor was captured, rather than eliminated, in 1984. We learnt everything: their origin in the twenty-third century, their purpose as historical researchers and the nature of their technology. The decision to eliminate rather than capture subsequent visitors was taken at levels far above my pay grade."

I struggled to absorb it. "If you knew they were historians, why kill them?"

Vane rose and walked to the window, looking out at the trees of the Surrey Hills.

"History is never just anything, Adam. It is the most powerful force in human affairs. It shapes policy, public opinion and national identity. It justifies or condemns actions in the present."

He turned to face me. The Union flag behind his desk hung perfectly still.

"Those who control what people believe happened effectively control what is real to everyone else."

"So the TSD's true mission isn't protecting national security," I said, the pieces finally locking together. "It's controlling history."

Vane gave a slight nod. "The visitors document everything with absolute accuracy. Military operations we have denied, political assassinations, government conspiracies, events that contradict official narratives. How do you think the world would react if irrefutable evidence of those operations became public? Not merely in our time, but in any time?"

"That's what this is about? Protecting government secrets?"

"It is about stability," Vane corrected. "Some truths remain dangerous even centuries later. The past must remain flexible if the present is to function."

I thought of the Book of Wars, with its meticulous accounts of battles and covert interventions that had never entered any official record.

"So you eliminate the visitors to stop them documenting what actually happened."

"We eliminate them to preserve necessary historical ambiguity," Vane said. "Their version of events would be devastatingly precise, stripped of the context or justification for certain actions. Black and white where we require shades of grey."

I leant forwards. "And what about the Book of Wars? The one I took?"

Something flickered in Vane's eyes. It was the first genuine emotion I had seen from him.

"That book contains records of operations so highly classified that fewer than twenty people know they occurred. Operation Nightjar is only one of them. Recovering the volume is a priority of the highest order."

"That's why you brought me here," I said. "Not to punish me for running. You want to know where I hid the book."

Vane returned to his desk. "Where is it, Adam?"

"Not here. Not anywhere you'll find it."

He studied me. "You were one of our finest field officers. Your ability to sense temporal arrivals gave us a tactical advantage no technology could match. I had hoped you might see reason and return to your duties."

"My duties included murdering innocent researchers," I said. "Thirty-one of them. All so you could decide which parts of history were allowed to survive."

Vane's face hardened.

"Those innocent researchers are gathering information that could destabilise governments, provoke international incidents or worse. The past must stay buried, Adam, for everyone's sake."

Before I could answer, his secure telephone rang. He looked at it, then back at me.

"This conversation is not finished."

He pressed a button on his desk and the door opened.

"Keep him secure," he told the waiting security officer, then picked up the telephone.

As I was led from the office into an adjoining waiting area, I saw Peter standing nearby, pale and rigid. I could tell he had heard everything through the TSD's internal monitoring system. His shock was naked.

The officer placed me in a chair from which I could see Vane through the glass wall. Vane stood with his back to us, speaking into the telephone.

Peter came over, walking stiffly, and dismissed the officer with a few quiet words. When we were alone, he spoke barely above a whisper.

"Is it true? What you said about the visitors?"

I nodded. "Every word. I have proof. Translations from their book, patterns in their appearances. They're documenting history, not threatening it."

Peter ran a hand through his hair. "And Vane?"

"He confirmed it."

"All this time we've been..."

He could not finish.

"Killing historians," I said for him. "To protect government secrets."

Through the glass, we could see Vane still on the telephone, gesturing sharply with one hand. Peter made his decision. I watched it happen in the tightening of his jaw and the squaring of his shoulders.

"The security-camera feed is looped for the next three minutes," he said, all hesitation gone from his voice. "There's a maintenance corridor behind us that leads to the vehicle bay. I can get you out, but we have to move now."

I stared at him. "You're helping me escape?"

"I joined to protect my country from threats," Peter said grimly. "Not to conceal its crimes. If we're doing this, we do it now."

I did not need telling twice.

Peter led me through a maintenance door and along a narrow corridor used by the cleaning staff. We moved quickly but carefully, avoiding the principal security checkpoints. His keycard opened doors that would have remained locked to anyone else.

"What made you decide to help me?" I asked as we hurried through the facility's lower level.

"Solihull," Peter said. "I never believed the explanation for that disaster. More than 2,600 people dead because Keane fired after Patel warned Vane that the temporal discharge could be catastrophic. Then I heard what Vane admitted just now."

He shook his head. "There are lines I won't cross."

We reached the vehicle bay, a broad underground garage holding the TSD's fleet of unmarked cars. Peter took a set of keys from a security cabinet and led me to an anonymous saloon.

"This one is clean. No active tracking system," he said, unlocking it. "I can get you through the perimeter checkpoint, but after that you're on your own."

I paused before getting in. "Come with me. I'm meeting someone who can help us understand more about the visitors."

Peter hesitated, then nodded. "If they discover I helped you, I'm finished here anyway."

We drove through the concealed Surrey compound, Peter presenting his Civil Service security credentials at each checkpoint. The guards waved us through without delay. Everyone knew and trusted him. Within minutes, we were on the main road heading south-east.

"They'll realise you're gone within twenty minutes," Peter said, checking the mirrors constantly. "Vane will lock down the facility and begin tracking procedures. We need to change cars as soon as possible."

"I have an emergency meeting point in Brighton," I told him. "Someone is waiting for me there."

"Your contact from Mexico City? The woman who can sense visitors as well?"

I nodded, unsurprised that he knew about Priya. The TSD would have reviewed every scrap of surveillance from Victoria Memorial.

"Two hours if we're fortunate," Peter calculated. "If we change vehicles and keep off the obvious routes, we may reach her before they establish roadblocks."

We stopped at an out-of-town shopping centre roughly sixty kilometres from the TSD facility. Peter bought two prepaid mobile phones with cash while I waited in the car, then drove to the far end of the car park.

"Leave this here," he said. "I'll deal with the next part."

He approached a middle-aged man getting into an ordinary hatchback, showed him something in his wallet, almost certainly his Civil Service security credentials, and spoke to him briefly. The man nodded, visibly nervous, and surrendered his keys. Peter handed him something in return, then came back to me.

"Borrowed transport," he explained, passing me the keys. "The owner receives a generous hire fee and collects his car tomorrow from the police vehicle pound, where our TSD saloon will mysteriously appear."

We transferred to the borrowed car and took secondary roads towards Brighton. Peter used one of the prepaid phones to monitor traffic conditions, keeping us away from the main routes where TSD officers or police roadblocks might appear.

"What's in Brighton?" he asked after we had been driving for an hour.

I bent down and drew the metallic object from my sock. "The answer may be in this. A visitor gave it to me just before you caught me."

Peter glanced at the object in my palm: a metallic disc roughly the size of an old 50-pence piece, engraved with unfamiliar markings.

"What is it?"

"I don't know exactly. The visitor told me to find the others when he gave it to me."

"Other visitors?"

"Perhaps. Priya may know more. She's been tracking their appearances for years."

We drove in silence for a while, each of us trying to digest the day's revelations. At last Peter spoke again.

"How many?" he asked quietly.

"How many what?"

"How many visitors did you eliminate during your time with the TSD?"

I kept my eyes on the road. "Thirty-one confirmed."

The number sounded worse than it ever had before.

Peter nodded slowly. "Twenty-four for me."

"Fifty-five between us," I said.

"Fifty-five historians," Peter replied. "Fifty-five people who were only trying to record what happened."

The horror of that truth remained in the car with us all the way to Brighton.

We reached the outskirts shortly after dark, left the borrowed car in a long-stay car park and used public transport to reach the seafront. The emergency meeting point Priya and I had arranged was a small cafe near the Sea Life centre, public enough for us to disappear among tourists but with several exits if we needed them. Peter and I entered separately, following counter-surveillance procedures we had both learnt during TSD training.

I went in first, searching for Priya while pretending to study the menu. She sat in a rear corner with a cap pulled low over her face and a laptop open before her. Relief surged through me when I saw her. She had escaped central London safely.

I ordered tea and carried it to her table. Her eyes widened slightly when she recognised me.

"You escaped," she said quietly as I sat down. "How?"

"I had help."

I nodded towards the entrance, where Peter had just appeared.

"He's with me. We can trust him."

Priya tensed as Peter approached.

"That's your former TSD colleague."

"Former is the important word," I said. "He helped me escape after he learnt the truth about the visitors."

Peter sat down.

"Priya Nair," he said. "We have a file on you. Self-taught specialist in temporal anomalies. One of the few known sensitives who does not work for the Government."

"And you're Peter Shaw," Priya replied coolly. "TSD elimination specialist with twenty-four confirmed murders of innocent historians."

Peter accepted the accusation without attempting to defend himself. "Yes. That is who I was."

I intervened before the exchange worsened.

"Priya, did you get out of London without difficulty?"

She nodded. "I followed our contingency plan. I left immediately after you were captured and came straight here."

She turned her laptop towards me. "And I've been working on this."

The screen displayed an analysis of the metallic object the visitor had given me. I reached into my sock again and placed the device beside the computer.

"You still have it," Priya said, plainly relieved. "I was afraid they had found it when they searched you."

"Ankle sock," I said. "An old intelligence trick."

Peter leant forwards, studying the disc and the data on Priya's screen.

"What is it?"

"A communications device," Priya said, entering commands that brought up another set of readings. "But nothing like any technology made in our time. I've been analysing its energy signature from scans I took before we separated in Mexico City."

"You scanned it?" I asked.

"I scan everything," she said. "Habit."

She indicated one of the graphs. "Look at this frequency pattern. It precisely matches the temporal distortions I've recorded when visitors appear. The device is designed to communicate through their network."

"Can you activate it?" Peter asked.

Priya shook her head. "Not fully. Not without knowing the correct commands. But I did manage to extract some data."

She typed again and brought up a map.

"Coordinates programmed directly into the device's memory."

The map showed a remote part of the Cairngorms in the Scottish Highlands.

"What's there?" I asked.

"Nothing marked on any official map," Priya said. "But according to the temporal-energy readings I've collected over the past five years, it is a centre of visitor activity. Not isolated appearances like the one we witnessed in Westminster, but multiple sustained presences."

Peter studied the map. "That's exceptionally isolated country. No public road comes within several kilometres of those coordinates. Why would they choose somewhere so remote?"

"Privacy," I said. "They would be beyond ordinary surveillance, away from the public and the TSD."

Priya closed the laptop. "I think it is more than that. It may be a meeting place or some form of operational base."

The implication struck me at once. "You think visitors are permanently stationed there?"

"It is possible. The readings differ from the transient signatures I usually detect. They are steadier, more persistent."

Peter sat back. "If that's true, the TSD knows nothing about it. We never found evidence of a permanent visitor installation."

I looked from Priya to Peter and then down at the device.

"The visitor told me to find the others. I think he gave us a means of contacting them directly. All of them, not merely individual researchers."

"If we go to those coordinates," Priya said, "we may finally learn why they are here and what they are documenting."

"Or walk into a trap," Peter cautioned. "The TSD will be searching for all three of us now. They'll have flagged our identities, frozen our accounts and alerted Border Force and the major transport hubs."

"Then we don't travel under known identities or use obvious routes," I said as a plan took shape. "We remain off-grid all the way to the Cairngorms."

Priya slipped the laptop into her bag. "I have cash, clean documents and contacts who can arrange transport without attracting official attention."

Peter looked between us, then reached his decision. "I know safe houses we can use on the way. TSD emergency sites that do not appear in the main database."

We rose to leave, conscious that every extra minute in one place increased the danger of detection. As we left the cafe, I felt the visitor's device concealed against my ankle and remembered what Vane had admitted. The TSD had never been protecting national security. It existed to decide which version of history survived.

The visitors were not threats. They were witnesses, recording truths that powerful people wanted buried. Now, with coordinates leading to what might be their base, we had a chance to reach the others, whoever or whatever they might be.

Priya led us along the seafront towards the place where her contact waited with transport. Peter followed, his unease evident in the constant movement of his eyes. I brought up the rear, alert for anyone following us. The coordinates in the Cairngorms seemed to draw us north, towards a possible refuge where visitors gathered and where we might at last learn the whole truth about the future historians and their mission to preserve the past.

The Cairngorm landscape closed around us after we left the rough forestry track that had carried us as far as it could. Peter led with a compact billhook, cutting only the limited Highland scrub that barred our passage and leaving as little trace as possible. Priya followed, checking her GPS unit every few minutes to ensure we remained on course. I brought up the rear with the Book of Wars secured inside my pack and the visitor's metallic device hidden in my pocket as we approached the coordinates.

It had taken us three days to reach this point. Priya's contact in Brighton had supplied an unmarked van with replacement registration plates. We had driven north through the Midlands and on through England, crossed into Scotland, then changed to a four-wheel-drive vehicle at one of Peter's off-book safe houses. The final stage had been on foot, an exhausting eight-hour climb through wild country without paths or signs of habitation.

"Half a kilometre," Priya said, pausing to check the GPS again. "We're close."

Every muscle in my body ached, but the growing warmth of the disc kept me moving. The device appeared to know that we were nearing whatever lay at the coordinates.

Peter stopped abruptly and raised one hand. We froze.

He pointed ahead, where the trees opened around a small clearing.

"That's it," Priya whispered after one final check of the GPS. "Those are the exact coordinates."

We approached cautiously, remaining among the trees. The clearing appeared unremarkable, perhaps fifty metres across, bordered by Scots pine and birch. Heather, rough grass and sparse mountain flowers covered the ground. There were no buildings and no visible technology, nothing to suggest it was anything more than a natural opening in the Highland woodland.

"Are you certain?" Peter asked, examining the area with the practised attention of a soldier searching for threats.

Priya nodded. "These are the precise coordinates stored in the device."

I stepped into the clearing. The air pressure felt different.

"There's something here," I said. "I can feel it."

The device in my pocket had become hot. I took it out, and all three of us stared as the metallic disc began to pulse blue.

"It's activating," Priya said, her eyes wide. "It must be responding to something here."

Peter moved around the perimeter, searching for concealed cameras or other surveillance equipment.

"I don't like standing in the open. If the TSD has satellite coverage of this sector..."

"It shouldn't," Priya interrupted. "I checked the imaging timetables. This area was not due to be scanned for another four hours."

I held the device in my palm and watched the blue pulses quicken.

"What do I do with it?"

"The visitor gave it to you," Priya said. "Perhaps it is linked to your touch."

I turned the disc over, studying the strange symbols engraved in its surface. They resembled the writing in the Book of Wars, complex logograms without any obvious terrestrial origin.

"Try pressing the centre," Priya suggested. "Activation controls are often placed centrally."

I pressed my thumb against the middle of the disc. For several seconds, nothing happened, and I began to withdraw my hand.

Then the device grew warmer and its pulsing blue light became a steady glow.

A low vibration filled the clearing, so deep that it was felt more readily than heard. The air six metres in front of us began to shimmer like heat above sun-baked pavement.

"What's happening?" Peter asked, moving closer, his hand instinctively reaching for the pistol at his hip.

"I don't know," I admitted.

The shimmering intensified. The air appeared to buckle, opening a wound in empty space: a vertical line of absolute darkness that slowly widened. Within seconds, it had become a doorway suspended above the grass.

Priya gasped. "A temporal gateway. I thought they must use something like this, but I've never..."

Her words died as figures appeared within the darkness.

Four human-like beings stepped through the doorway and into the clearing. As they emerged, I understood why the visitors had always looked subtly wrong in our world.

This was their true appearance, not the disguises they wore while observing us. They were slightly taller than most humans, with proportions that were almost, but not quite, familiar. Their arms and legs were a little too long, their bodies unusually slender. Their skin was pale and faintly translucent, and their features seemed carved rather than grown: high cheekbones, broad eyes in shades of amber and grey, and smooth, hairless heads. Each wore close-fitting clothing made from a material that appeared to absorb and reflect light at once.

"They aren't wearing disguises," Priya whispered. "This is what they really look like."

One of the visitors stepped forwards. When it spoke, its voice was melodic and accented, but its English was clear.

"Adam Mercer. We have been expecting you."

I stared at it, unable to speak. After years of hunting these beings, after murdering thirty-one of them, I stood before them in their true form.

"How do you know my name?" I finally asked.

"We know all the eliminators," a second visitor said, its voice deeper than the first. "Especially those responsible for substantial losses among our researchers."

Peter stepped forwards. "I was one of them as well. Peter Shaw. Twenty-four of your people died because of me. Adam and I killed fifty-five between us."

The visitors regarded him without visible emotion.

"We know."

Priya came to stand beside me. "I'm Priya Nair. I've tracked your appearances for years. I can sense your arrivals, as Adam can. The warning always begins exactly twenty-four seconds before you appear."

"The sensitives," the third visitor said. "You are rare among your kind, and valuable."

I raised the glowing disc. "The visitor at Victoria Memorial gave me this. He told me to find the others. Did he mean you?"

The first visitor nodded. "He belonged to our research team. Contacting you involved considerable risk, but when we learnt that you had turned against the Directorate, we agreed it had become necessary."

"What is this place?" I asked, glancing around the clearing. "Why here?"

"This site lies at the convergence of electromagnetic conditions that facilitate temporal transition," the fourth visitor explained. "We established the gateway fourteen of your years ago, when our mission entered its principal phase."

"Your mission?"

"To document history."

The first visitor, who seemed to lead the group, indicated a fallen pine at the edge of the clearing.

"Please sit. We have much to explain, and your journey has been long."

We sat on the trunk. The visitors arranged themselves opposite us, their movements disconcertingly smooth. Behind them, the gateway remained open like an upright hole cut into the world.

"In our time," the leader began, "Earth suffered what we call the Great Data Collapse of 2187. During a period of global conflict, the digital infrastructure containing humanity's collective knowledge was systematically destroyed. Physical archives had long since been digitised and many originals discarded. When the networks failed, nearly three centuries of recorded history were lost."

"Everything?" Priya asked. "Books, films, documents?"

"Not everything," the second visitor said. "Fragments survived. Enough for us to understand the scale of what had vanished, but not enough to reconstruct it accurately. The gaps in the historical record created dangerous opportunities for manipulation and revision."

"Let me guess," Peter said. "Governments and other powerful interests began rewriting the missing history to serve themselves."

The visitors looked at one another.

"Precisely," their leader said. "Within one generation, historical claims became political instruments. Wars were erased or invented. Heroes became villains, and villains became heroes. The ease with which the past could be changed created instability in the present."

"So you developed time travel," I said, "to see what really happened."

"We developed temporal-observation technology," the third visitor corrected. "We cannot alter the past. The physics of temporal displacement makes that impossible. We can only observe, record and return with accurate evidence."

"The Book of Wars," I said, understanding fully at last. "It's part of that record."

The leader nodded. "One of many volumes. We place particular emphasis on human conflict because understanding the true causes and consequences of historical wars may help us prevent the same patterns from recurring in our own time."

"But the TSD hunts you," Priya said. "It has been eliminating your researchers for decades."

"Yes," the fourth visitor replied. "Your government discovered our programme during its early stages. Instead of welcoming an accurate account of history, those responsible perceived it as a threat to their control of historical narratives."

"That's what Director Sir Malcolm Vane told me," I said. "He said some truths were too dangerous and that the past had to remain flexible."

The visitors' expressions did not change, but a subtle shift in their posture conveyed disappointment rather than surprise.

"That is a common response among those who benefit from historical ambiguity," the leader said. "In every era, some prefer convenient myths to inconvenient truths."

I stood, unable to remain seated.

"I killed thirty-one of your researchers. I didn't know what they were. The TSD told us you were infiltrators trying to change our timeline."

"We know what you were told," the leader said calmly. "We also understand manipulation and misinformation. You were made into a weapon by people who feared the truth."

The words offered no absolution. I had still aimed the nullifier pistol and pulled the trigger thirty-one times. I had watched thirty-one living bodies collapse at the molecular level and vanish without residue.

"I want to put it right," I said. "I know classified details of operations in which I took part, missions that never entered any official record, including aspects of Operation Nightjar and intelligence activities the Government denies ever occurred. I can help fill some of the gaps."

The visitors appeared to confer without words, exchanging subtle glances and movements too slight for me to interpret. At last their leader spoke.

"Your offer is valuable, Adam Mercer. First-hand accounts from participants in undocumented conflicts would significantly strengthen our historical record."

"I'll tell you everything I know," I promised. "Every operation, every location and every name I can remember."

"That would be most useful," the second visitor said. "But we require more than your memories."

"What else?"

"Allies," the leader said. "Human allies with your unusual abilities. Our researchers remain in constant danger while carrying out their work. Sensitives such as you and Priya could protect them by warning them when TSD personnel approach."

Peter stepped forwards. "I know TSD procedures, tracking systems and elimination tactics. I can help as well."

The leader regarded him with amber eyes. "Yes. Your knowledge would be of considerable value."

Priya came to stand beside me. "I've tracked visitor appearances for years. I've identified cycles and calculated probabilities for future observation missions. I want to help."

"Together, you represent an opportunity without precedent," the leader said. "With your assistance, we could complete our documentation with far fewer losses."

The third visitor suddenly turned towards the open gateway.

"There is a problem."

The leader glanced back, then faced us again. "Our sensors have detected satellite imaging directed at this location. It was not part of the regular timetable."

"They found us," Peter said grimly. "The TSD must have reconstructed our movements."

"How much time do we have?" I asked.

"The satellite pass is complete," the fourth visitor said. "Under standard TSD response protocols, ground forces could arrive within ninety minutes."

Priya checked her watch. "We need to move. If we return to the vehicle now..."

"You have a choice," the leader interrupted, looking directly at me. "You may flee and continue evading the Directorate, or you may come with us."

"Come with you? Where?"

"To our operational base. It exists slightly out of phase with your timeline and is accessible through this gateway, but cannot be detected by your technology. We can protect you there while you assist our work."

I looked at Priya and Peter, then back at the visitors.

"All of us?"

"All who choose to come," the leader said. "But the decision must be made now. Once closed, this gateway cannot be reopened for some time without increasing the risk of detection."

Peter shook his head. "I can't simply disappear. I have family. People who would search for me."

"I understand," the leader said. "Perhaps you may serve our purpose in another way."

Priya took my hand.

"I'm going wherever the answers are. I've spent my life trying to understand what you are and why you're here. I'm not turning back now."

I thought of what awaited me if I stayed: perpetual flight, every crowd a danger, every quiet night spent waiting for the TSD to find me. But I also thought of what I could offer the historians. I possessed first-hand knowledge of events the Government had tried to erase, and I could sense the arrival of their researchers before anyone else knew they were coming.

"If I go with you," I asked the leader, "can I still help protect your researchers in our time? Can I do anything to make amends for the harm I've done?"

"That is precisely why we would welcome you," the leader replied. "Your knowledge and abilities would be essential to our mission."

I made my decision.

"I'll come with you. I'll help preserve the truth, whatever it costs."

Peter placed a hand on my shoulder.

"I can't go, but I can draw them away. I'll leave the clearing and plant evidence that all three of us are travelling west. It may buy you the time you need."

"They'll know you helped us escape," I warned. "They'll hunt you."

Peter nodded. "I know. But I have to put things right in my own way. Twenty-four lives taken because I believed their lies. I'll find my own road to atonement."

We embraced as soldiers do before a mission, quickly and firmly.

Priya and I gathered our packs. I made certain the Book of Wars was secure before the visitors moved towards the dark doorway.

"What should we expect on the other side?" Priya asked.

"A research facility," the leader said. "A place where we analyse and compile our observations, train new field historians and, with your help, continue our work of preserving historical truth."

The distant throb of helicopter rotors rolled between the mountains. The TSD was coming.

"It is time," the leader said, gesturing towards the gateway.

Peter checked his pistol and adjusted his pack.

"I'll head north first, then turn west and draw them away from the clearing."

He looked at me for the last time.

"Good luck, Adam. Do what we should have been doing all along. Protect the truth."

Then he disappeared among the Scots pine and birch, deliberately moving away from the route we had taken.

Priya and I approached the gateway with the four visitors. Beyond the threshold, I could see nothing but darkness. The disc in my hand shone with steady blue light, and the Book of Wars pressed against my back inside the pack.

I was not free of fear. I carried the memory of thirty-one erased people and the knowledge that an entire state machine would keep murdering to defend its chosen past. Yet beneath the fear was determination.

After years spent destroying these historians and their work, I would help protect what remained.

Priya stepped through beside me. Together we left one world and entered another, committed to preserving history in all its complexity for generations not yet born, however powerful the people who wanted it buried.