The Rules at Blackthorn Storage

For three months, I had sent out application after application and had nothing to show for it. I was nineteen, fresh out of sixth form with my A-level results and GCSEs, but no vocational experience, and not one employer in Sheffield seemed willing to take a chance on me. My bank balance had dwindled to double figures, and my parents' patience was wearing even thinner.

That was when I saw the advert on the community noticeboard outside a local supermarket.

Night security officer required. Blackthorn Self Storage. No experience necessary. GBP15 per hour.

For someone my age, the pay was exceptional. I tore off the tab with the telephone number before anyone else could take it and rang immediately from my car. At half past four in the afternoon, I expected to get an answering service. Instead, a man picked up on the second ring.

"Blackthorn Self Storage. Martin Blackthorn speaking."

"Hello, I'm calling about the night security officer position."

There was a pause.

"Are you over eighteen?"

"Yes. I'm nineteen."

"Are you available for overnight shifts from ten at night until six in the morning?"

"Definitely," I said, trying to sound as though staying awake all night was perfectly normal for me.

"Come in tomorrow at 15:00 for an interview. Ask for Martin."

He hung up before I could thank him.

The following day, I drove out to an ageing industrial estate in Sheffield's Lower Don Valley. Blackthorn Self Storage was a three-storey concrete building, a great rectangular block lined with rows of identical metal roller-shutter doors. I parked in the nearly empty car park and went into reception.

A bell jingled as I pushed open the glass door. The reception area was small but clean, with a counter, several chairs and a doorway leading to a staff room where I could see a kettle, mugs and a jar of instant coffee. No one was there.

"Hello?" I called.

A door behind the counter opened. A man in his forties stepped out, his hair greying at the temples. He wore a collared shirt with the sleeves rolled to his elbows, and his face bore the sort of lines that came from stress rather than age.

"You must be Callum," he said without quite smiling. "I'm Martin Blackthorn, the facility manager."

We shook hands across the counter. His grip was firm and his palm was dry.

"Have a seat."

He came around the counter with a clipboard and indicated one of the chairs. I sat, adjusted the plain tie I had borrowed from my father and tried to look responsible and trustworthy.

Martin did not begin with the usual interview questions. He went straight into the details of the job.

"The night security officer works from 22:00 to 06:00, five nights a week. You'll have Tuesdays and Wednesdays off. The pay is GBP15 an hour, paid weekly. Does that suit you?"

I nodded rather too quickly.

"Yes. That's perfect."

"The job is straightforward. You watch the security monitors, make rounds every two hours and make sure nothing unusual happens."

"Such as break-ins?"

"Sometimes," he said, but did not elaborate. "There are a few security issues you'll need to know about. The camera system is old and occasionally cuts out. Some doors don't latch properly. The building makes noises as it settles at night."

Everything he said was plausible, yet there was something odd in his delivery. It sounded rehearsed, as though he were reciting a prepared explanation while withholding the important part.

"We have a specific set of procedures for night guards," Martin said, drawing a sheet of paper from beneath the clipboard. "They are non-negotiable."

He handed it to me.

I had expected ordinary security protocols. What I read made me stop.

1. Make rounds every two hours.

2. Always be polite to the old woman in unit G4, but never open the door for her.

3. Keep all visits to the toilet under five minutes.

4. If you hear your name called, confirm who is speaking before you answer.

5. Ignore all noises coming from unit F9.

6. Do not enter any unit after midnight, regardless of the circumstances.

7. If the lights flash three times, return to the security office immediately.

The list continued with more instructions, each stranger than the last. I looked up, expecting Martin to smile or admit it was a prank played on new starters. His expression remained entirely serious.

"Is this genuine?" I asked, keeping my tone light.

"Very."

"But why?"

"It's an old building with certain quirks. These rules help our night guards deal with those quirks efficiently."

I read the list again.

"So there's an old woman living in one of the storage units?"

"No," Martin said quickly. "No one lives here. That would be against policy. Tenants occasionally come in at unusual hours, though. The woman associated with G4 is elderly and sometimes confused. Be polite, but don't open the door for her. She has her own key if she has a legitimate reason to gain access."

That made slightly more sense, although it did not explain half the rules on the page.

"And what's inside unit F9?"

"Nothing that concerns you." His tone made it clear that the subject was closed. "Follow the rules, Mr Price, and you'll be fine."

I needed the job too badly to press him.

"I understand."

Martin relaxed a little.

"Good. Now, do you have any relevant experience?"

The rest of the interview went more as I had expected. He asked about my background, my availability and why I wanted the job. I spoke about being responsible, paying attention to detail and needing stable work. Martin made notes, but he did not seem particularly interested in my answers. I had the unsettling impression that he had decided to employ me before I had walked through the door.

After about fifteen minutes, he put down his pen.

"Well, Callum, the position is yours if you want it. Can you start tomorrow night?"

I blinked, surprised by how easy it had been.

"Yes. Definitely."

"Good. I'll show you round before you leave."

Martin led me from reception into the storage building. The main entrance opened on to a broad corridor with units on both sides. Their metal roller-shutter doors looked identical apart from the numbers. The air smelt of dust and something faintly chemical, perhaps cleaning fluid.

"There are three floors," Martin explained as we walked. "G units are on the ground floor, F units on the first and S units on the second. Each floor has its own security panel for access outside normal hours."

He pointed out the lift and stairs, then took me to the security office, a small room near the entrance. A bank of monitors displayed grainy feeds from cameras throughout the building.

"You'll spend most of your time here. The monitors cover all seven corridors, the fire exits and the stairwells. That panel controls the lighting. The dedicated red telephone is linked to the monitoring company and can also be used to ring 999."

Next came the maintenance room, which was filled with cleaning supplies, tools and electrical panels.

"You shouldn't need to come in here unless there's a problem with the lights," Martin said, closing the door rather quickly.

We completed the tour by walking around each floor. The layout was simple: long corridors with storage units on both sides, fire exits at either end and stairwells in the corners. Everything appeared normal, if somewhat dated.

When we returned to reception, Martin gave me a set of keys, a heavy-duty torch and a two-way radio.

"The keys open all the communal areas and the security office. The master key for the units is kept in the office safe. The combination is 271154. Use it only in an emergency."

He demonstrated the radio.

"Keep this with you on your rounds. I'm on channel two if you need me."

I slipped the equipment into my pockets, feeling oddly official.

"Is there anything else I should know?"

Martin hesitated.

"Just follow the rules, Callum. They're there for a reason. The night shift can be difficult sometimes."

"I can manage it," I said with more confidence than I felt.

"We'll see. Most night guards struggle with the solitude. The building makes noises, and the mind can play tricks when you're alone for hours."

"I'll be fine. I'm used to staying up late."

Martin nodded, although he did not look convinced.

"Report at 21:30 tomorrow. I'll set you up before I leave."

As I walked back to my car, I glanced over my shoulder. Martin was watching me through the reception window. His expression was difficult to read. There was hope in it, but also worry, as though he were sending me somewhere he was not certain I would return from.

That was ridiculous. It was only a self-storage building. The rules were peculiar, but every workplace had its oddities. For GBP15 an hour, I could tolerate a few strange procedures in an old building that made noises at night.

As I drove home, I kept telling myself that it was a normal job with a few quirks. There was nothing to worry about.

I pulled into the car park at Blackthorn Self Storage at 21:28, two minutes early for my first shift. The building looked different in darkness. It was less ordinary and far more imposing, with the security lights casting strange shadows across the concrete exterior.

I sat in my car for a minute and reread Martin's list. Some of the rules still seemed absurd, but I needed the job too badly to question them. GBP15 an hour meant the difference between gaining some independence and becoming entirely dependent on my parents again.

Martin was waiting beside the front entrance, keys jingling in one hand.

"Bang on time," he said. "Good."

He took me inside, where fluorescent lights buzzed overhead. During the day, the corridors had looked perfectly normal. Now they stretched away into silence, lined by identical doors that seemed far more sinister than they had any right to.

"You'll be alone from 22:00 until morning," Martin said as we walked towards the security office. "You can ring me if there's a genuine emergency, but I stress the word genuine."

His tone made it clear that he did not want to be disturbed unnecessarily.

The security office looked exactly as it had during the tour: a small room with a desk, a chair and a wall of monitors showing grainy black-and-white footage of corridors, stairwells and exits.

Martin handed me a thick ring binder.

"This is the full rule book. Read it during your shift. The condensed list I gave you covers the essentials, but there are details you need to know."

I leafed through the pages. They contained precise instructions concerning particular units, responses to different sounds and procedures for different times of night.

"The standard patrol routes are marked here," Martin continued, pointing to a laminated plan on the desk. "Rounds every two hours, without exception. Record the times in the logbook."

He went over the radios again, showed me how to check the camera feeds and explained the emergency procedures. It was all fairly standard until he pointed beneath the desk to a red button.

"That's the panic button. It locks every exit and interior door simultaneously. Use it only in extreme circumstances."

"What counts as extreme?"

Martin gave me another of those unreadable looks.

"You'll know if it happens."

He checked his watch.

"It's nearly 22:00. Any questions before I go?"

I had dozens, but chose the most practical.

"Where can I make coffee?"

Martin actually smiled.

"In the staff room down the corridor. There's a kettle, mugs and instant coffee. Don't drink more than you need. And remember that visits to the toilet are limited to five minutes."

I nodded.

"Good luck, Price. Remember the rules."

With that, Martin left. His footsteps receded along the corridor until the heavy front door shut with a solid clunk.

I was alone.

At first, I kept busy by checking each monitor and making certain I understood the layout. The three-storey facility contained seven corridors in total. The cameras showed nothing but closed doors and empty passageways.

At exactly 22:00, I made my first entry in the logbook.

All clear. Beginning first shift.

The words looked small and insignificant on the page.

The first two hours passed slowly. I worked through sections of the rule book, trying to memorise the most important instructions. Some were sensible: check every fire exit during patrols; report signs of forced entry.

Others were much harder to understand.

Rule 12: If you see a puddle forming without a visible source, leave the area immediately and record its location in the logbook.

Rule 17: Ignore children's voices heard after midnight.

Rule 23: If your radio transmits uninterrupted static for more than ten seconds, switch it off for exactly one minute before trying again.

At midnight, I began my first patrol. The corridors were silent apart from the hum of the fluorescent lights and the soft tread of my shoes. I carried the torch and radio as instructed and followed the route through each floor.

The ground floor was straightforward enough. Units G1 to G20 lined a long corridor that looped back towards the entrance. I checked each door to ensure it was secure.

When I reached unit G4, I heard quiet sobbing from inside.

I stopped and shone my torch at the roller-shutter door. The rules had specifically mentioned an old woman connected with this unit. I was to be polite, but I must never open the door for her.

The sobbing grew louder and more distressed.

"Hello?" I called, keeping my voice professional. "Is someone there?"

"Please," replied a wavering elderly voice. "Please help me. I'm locked in."

The door had a small viewing window at eye level. I stepped closer and shone the torch through it.

An old woman stood in the centre of an otherwise empty unit. Her grey hair was dishevelled and her face was streaked with tears. She wore what appeared to be a nightdress, and her thin arms were wrapped around her body as she shivered.

"I can't get out," she said, looking straight at me. "The door won't open from inside. Please, young man."

I tried the external handle, but there was no ordinary means of opening it. The door appeared sealed, with no accessible lock.

"I'm sorry," I said, remembering the rule. "I can't open the door. Do you have your key?"

Her expression changed for a fraction of a second. Something I could not identify flashed across her face before she resumed looking frightened and helpless.

"No. No key. Please, I'm cold. I've been trapped for hours."

"I'll ring my manager," I lied, stepping away. "He'll know what to do."

"No."

Her voice became sharp.

"Don't leave me. Just open the door. It's a simple kindness."

I took another step back.

"I'm sorry, but I can't."

Her weeping intensified as I continued my round. It became frantic, then rose into wails that followed me along the corridor. I forced myself to keep moving, checking the remaining doors almost mechanically while her cries echoed behind me.

What kind of place kept an elderly woman locked inside a storage unit? Perhaps she really was a confused tenant who had somehow become trapped. Perhaps she had dementia and did not understand why she could not reach her belongings after hours.

Whatever the explanation, the rule was clear, and I needed this job.

I finished the ground floor and climbed to the first. By the time I entered the stairwell, I could no longer hear the woman crying.

The first floor was completely silent. Rows of F units showed no signs of activity. I passed F9 quickly, remembering the instruction to ignore every sound that came from it.

The second floor was equally quiet. I completed my checks and returned to the security office by 00:45.

In the logbook, I wrote: No irregularities except apparent occupant in G4 requesting release.

The next hour dragged. I repeatedly checked the camera covering the corridor outside G4, but there was no sign of the old woman. Had she simply fallen silent, or had she never been there at all?

At 02:00, halfway through my shift, I needed the toilet. There were two in the facility, one close to reception and another on the second floor. I chose the nearer one.

The toilet was basic, with two cubicles, two washbasins and harsh overhead lighting that buzzed incessantly. I checked that I was alone, then went into the cubicle furthest from the door.

I was washing my hands when I heard it.

Heavy breathing came from the other cubicle, followed by a shuffling noise, as though someone inside were changing position.

I froze with water running over my hands. I had checked the room. It had been empty.

"Hello?" I called. My voice sounded smaller than I intended.

The breathing became louder. Then something began scratching against the metal divider between the cubicles.

Rule 3: Keep all visits to the toilet under five minutes.

I did not know whether this was the reason for the rule, but I was not staying to find out.

I shut off the tap and headed for the door without drying my hands. The scratching grew louder, followed by the sound of nails dragging across metal towards the cubicle door. I quickened my pace, not quite running.

As I reached for the outer door, the cubicle behind me creaked open.

I did not look back. I pushed into the corridor and let the door swing shut behind me.

Back in the security office, I wiped my trembling hands on my trousers and checked my watch. The entire visit had lasted less than three minutes.

I stared at the ring binder, then dragged it closer. There had to be some explanation for what was happening. I searched the pages for references to toilets, breathing or scratching.

I found the relevant section on page twenty-seven.

If you hear unexplained breathing, scratching or movement in either toilet, leave immediately. Do not investigate the source.

So it was not only me. This had happened often enough for someone to write a specific rule about it.

I read on, finding more details about the things I might encounter. One section concerned people asking for help.

You may encounter individuals requesting assistance, including but not limited to an elderly woman claiming to be locked in G4, a man with a missing eye requesting medical help, or children claiming to be lost. Do not render aid, open doors or allow these individuals to touch you. Maintain polite verbal contact if necessary, but disengage as quickly as possible.

Another passage dealt with the forbidden unit.

Unit F9 is strictly off limits to all personnel. Do not enter unit F9 under any circumstances, regardless of sounds or apparent emergencies originating within. Do not attempt to view the interior of F9 by any means. If its door appears open, do not approach. Return to the security office immediately and press the panic button.

I spent the next hour reading the rule book from cover to cover, growing more anxious with every page.

What kind of self-storage facility needed rules like these? What were they keeping here?

At 04:00, I began my second full patrol. This time G4 was silent.

I paused outside and looked through the viewing window. The unit was completely empty. There was no old woman and no furniture, only bare concrete walls and floor.

I checked the door again. It was securely locked, with no obvious way for anyone to have been trapped inside.

Had I imagined her? Was I more tired than I realised?

I completed the rest of the patrol without incident, although I passed the toilet more quickly than necessary. The shadows seemed too long, and the distant sounds of machinery were almost like whispered voices.

Back in the security office, I checked the records for G4. According to the rental logs, the unit had been empty for four months. There was no current tenant and no record of recent access.

As dawn approached, pale light entered through the small office window. My shift was nearly over. I had survived my first night, but I had questions.

At 05:45, I made my final patrol. In the early morning light, the facility looked different again. It was only a concrete building filled with storage units. There was nothing frightening about it.

G4 remained silent and empty. The toilet was merely a toilet, with no breathing or scratching from the cubicles.

I returned to the security office to complete the logbook. Although I was supposed to record every unusual occurrence, I did not know what to write. If I described an old woman who had not been there or breathing from an empty cubicle, would Martin think I was hallucinating? Would I lose the job before I had properly begun?

In the end, I wrote only: 05:45. Patrol complete. All secure.

At exactly 06:00, Martin arrived to relieve me. He looked rested and alert, which made me realise how exhausted I must have appeared.

"How was your first night?" he asked, studying me carefully.

"Fine. Quiet."

"No incidents to report?"

I hesitated.

"I thought I heard someone inside G4, but when I checked later, it was empty."

Martin nodded without surprise.

"That happens sometimes. The building settles and makes noises. Did you follow the rules?"

"Yes. I didn't open any doors."

"Good."

He seemed genuinely relieved.

"That's the most important thing here, Callum. Following the rules keeps everyone safe."

I wanted to ask what he meant by everyone, but exhaustion was catching up with me. I gathered my belongings, handed over the security keys and walked towards the door.

"Callum," Martin called after me. "You did well for a first night. Most people..."

He stopped and reconsidered his words.

"Just keep following the rules and you'll be fine."

I nodded and left, crossing the car park in the morning light.

As I drove home, the night's strangeness began to feel dreamlike and less substantial. Perhaps it had only been my imagination playing tricks in an unfamiliar place during my first overnight shift. Perhaps the sounds had ordinary explanations: pipework, ventilation, the building settling.

Or perhaps something else was happening inside Blackthorn Self Storage, and the rules existed to protect us from it.

Either way, I would be back that night. At GBP15 an hour, I could not afford not to be.

The banging from F9 began during my third night shift.

At first, it was only an occasional thud, the sort of noise any old building might make after dark. By midnight, however, it had become a steady, forceful pounding.

Someone, or something, wanted to get out.

I checked the condensed rules again.

Rule 5: Ignore all noises coming from unit F9.

That was clear enough, but knowing what to do and actually doing it were very different things.

Each blow sounded louder than the last. The instant coffee in my mug trembled with every impact. I turned up the small DAB radio and found a dull overnight phone-in programme. The presenter's monotonous voice helped mask the pounding, but I always knew it was there.

My midnight patrol began without trouble. I passed G4, where the old woman had appeared two nights earlier, but the unit remained silent. The toilet where I had heard breathing was only an empty toilet now.

Perhaps I was becoming accustomed to the place. Or perhaps the quirks Martin had mentioned were giving me a respite.

Then I climbed to the first floor, and the pounding from F9 became impossible to ignore.

Every impact shook dust from the ceiling. From the far end of the corridor, I could see F9's roller-shutter door rattling in its frame. The sound had developed a pattern.

Three hard knocks. A pause. Three more.

I remembered the warning in the ring binder.

Do not enter unit F9 under any circumstances, regardless of sounds or apparent emergencies originating within.

As I passed, I kept my eyes fixed on the opposite wall. The knocking intensified when I drew near, as though whatever was inside knew exactly where I was.

Back in the security office, I checked the camera feed covering F9's corridor. The knocking continued, and the door visibly trembled, but it remained shut. No one appeared in the corridor.

According to the rental records, F9 had been sealed and unrented for more than a decade.

So what was making that noise?

The pounding continued through my 02:00 patrol. This time, I changed my route to avoid passing F9 directly, using the stairwell at the opposite end of the building.

Even so, the noise followed me throughout the facility. It was a constant reminder of whatever waited behind that door.

After completing the indoor patrol, I decided to inspect the exterior. Martin had mentioned it as part of my duties, though I had neglected it during my first two nights. The cold air felt good after hours inside the stuffy building.

I walked around the perimeter, sweeping the beam of my torch across the empty car park and the fence beyond.

That was when I saw him.

A middle-aged man stood near the rear entrance, hunched over and swaying. My torchlight caught him, and he turned towards me.

The right side of his face was a ruin of blood and torn flesh. Where his right eye should have been, there was only an empty socket that appeared to be still bleeding.

"Please," he called, his voice strained. "Please help me."

I froze.

The rule book's warning flashed through my mind. Do not render aid to individuals who ask for help.

But this was different, surely. This looked like a real emergency. The man was badly injured and might be dying.

"I was attacked," he said, staggering towards me. "I need an ambulance."

Before I could retreat, he caught hold of my arm. His hand was ice-cold, and his grip was astonishingly strong for someone who looked ready to collapse.

"You have to help me," he insisted. Blood ran down his cheek. "Ring someone. Please."

I stared at him. The uninjured side of his face looked ordinary, but the wound was catastrophic. There was so much blood, yet he remained upright and coherent. Shouldn't an injury like that have sent him into shock?

"I'm sorry," I said, wrenching my arm free. "I can't help you."

His expression changed instantly. Anger replaced pain.

"What do you mean, you can't? I'm bleeding to death."

He reached for me again, but I stepped back. The rule book had specifically warned me not to let these people touch me. Was this what it meant?

How could Martin, or anyone connected with the business, have known I would meet a man with a missing eye in the car park?

"The Northern General Hospital is only a few miles away," I said, continuing to back towards the building. "I have to return to my post."

"You piece of [expletive]," the man snarled, his remaining eye widening. "You're just going to let me die."

Every step away from him felt wrong. Every decent instinct told me to help him, to ring 999 and ask for an ambulance, to do something.

But the rules had been right about the old woman in G4. What if they were right about this as well?

"I'm sorry," I repeated as I reached the door. "I can't help you."

I slipped inside and locked it behind me.

The man immediately began hammering on the door. His fists struck the same rhythm I had heard from F9 all night.

Three quick knocks. A pause. Three more.

"Let me in!" he shouted, his voice muffled by the heavy door. "I know you're in there!"

I stood with my back pressed against the door, my heart pounding, trying to convince myself that I had done the right thing.

After what felt like an eternity, but could only have been a few minutes, the knocking stopped.

When I looked through the small security window, the man had vanished.

I returned to the security office and dropped into the chair, trembling.

Had I just allowed a seriously injured man to walk away without help? What sort of person did that make me?

But if the rules were right, if he had not been a real man at all, then what had I seen?

I replayed the exterior camera recording from the time of the encounter. The car park was completely empty. According to the footage, I had stood outside talking to nothing.

By 04:00, I could no longer bear being inside the building. The rhythmic pounding from F9 continued, and every time I closed my eyes, I saw the man's bloodied socket.

I needed fresh air, space and something normal. The rule book allowed one 30-minute break during the shift. I announced over the radio that I was taking mine, feeling foolish as I spoke to an apparently empty building, then went to my car.

The nearest twenty-four-hour petrol station was about five minutes away and had a small convenience shop. Its brilliant lighting and the sight of a bored cashier reading a magazine felt wonderfully ordinary after Blackthorn Self Storage.

I bought a paper cup of tea and a pre-packed cheese and pickle sandwich I did not even want, simply to have an excuse to speak to another human being.

As I walked back towards my car, I noticed flashing blue lights at the far end of the forecourt. Two marked police cars and an ambulance were parked there, their lights reflecting across the wet tarmac. Blue-and-white police cordon tape sealed off an area near the commercial bins at the rear of the petrol station.

Curiosity drew me closer.

Police officers were gathered around something on the ground. A body lay partially covered by a sheet. From where I stood, I could see the dead person's clothing and the undamaged side of his face.

The paper cup fell from my hand, spilling tea across my trainers.

It was him.

The same man who had seized my arm less than two hours earlier. The same jacket, the same build and the same features on the uninjured side of his face.

"What happened?" I asked a bystander watching the scene.

"Someone murdered him," the man said. "An employee found him while taking rubbish out."

A detective was speaking quietly to a uniformed constable nearby, but their voices carried through the still night.

"The police pathologist's preliminary estimate puts death at least six hours ago. The body's cold and rigor has already begun."

Six hours ago.

I had spoken to him less than two hours earlier.

I backed away and collided with a display of screenwash. Several police officers glanced towards me. I turned quickly and hurried back to my car, my stomach twisting hard enough to threaten the little food I had eaten during the shift.

It was impossible.

The man who had spoken to me, the man who had gripped my arm with such strength, had been dead for hours before I met him.

Martin had been right about the rules.

What I had seen was not human.

The drive back to Blackthorn Self Storage passed in a blur. When I entered the car park, I found another car waiting there: a dark saloon I recognised as Martin's.

He stood beside it with his hands in his coat pockets, his breath misting in the cold air.

I parked and climbed out slowly, my legs unsteady.

"You left the building," Martin said.

It was not a question, but neither was it quite an accusation.

"I took my break."

Martin nodded.

"And before that, you encountered someone in the car park. A man with an injured eye."

I stared at him.

"How did you know?"

"The same way I know you didn't help him. You followed the rules."

The relief in his voice was unmistakable.

"That's good, Callum. Very good. What you saw wasn't a man at all."

"What do you mean, it wasn't a man?" My voice came out sharper than I intended. "I saw him. I spoke to him. He grabbed my arm."

Martin looked at the storage building behind us, then back at me.

"We should continue this inside."

I followed him through the main entrance. The pounding from F9 had stopped. The entire building was silent.

In the security office, Martin sat behind the desk - my desk during night shifts - and left me standing. He ran a hand through his greying hair.

"You've been following the rules," he said. "That's good. Most people don't last this long."

"What exactly is happening here? What happened tonight?"

Martin reached into his jacket and produced a small flask. He took a quick mouthful, then offered it to me. I shook my head.

"This facility isn't what you think it is," he began. "It isn't merely a storage building. It's a junction, a place where our reality overlaps with others."

I stared at him.

"You're saying the place is haunted?"

"Not haunted. Haunted suggests ghosts - remnants of people who were once alive. What we have here are entities. Things that were never human. They exist in those other realities, but at the junction they can reach through and test the boundaries."

"Test the boundaries," I repeated. "By trying to persuade me to open doors or help injured people?"

Martin nodded.

"Exactly. They mimic human beings because it works. They study us and learn what provokes our empathy or curiosity. They're very good at appearing harmless, vulnerable or desperate."

"Why? What do they want?"

"Access," Martin said simply. "A way in. They can't enter our reality fully without assistance. They need someone here to invite them across or break the rules that keep them out. The old woman you saw in G4 and the injured man in the car park weren't real. If you'd opened that door or tried to take that man to hospital, something would have crossed over. Something dangerous."

My thoughts returned to the crying woman, the breathing in the empty toilet cubicle and the injured man who had already been dead for hours.

"Why me?" I asked. "Why does this job exist?"

Martin opened a drawer and removed a thick leather folder.

"You aren't the first night guard we've employed, Callum. Not by a very long way."

He placed the folder on the desk and opened it. Inside were yellowed pages filled with handwritten notes and old photographs. The formal personnel record began with an entry dated 28 October 1963.

"The early research started in 1952," Martin explained, turning the pages. "My grandfather built this facility later, after studying the site. At first, he didn't understand what he had found. He only knew the land was cheap. As construction progressed, workers reported strange incidents. Tools vanished, voices came from nowhere, and people appeared in areas that had just been searched."

The photographs showed the building at various stages of construction. In one, a group of workers stood in front of the newly completed facility. In an upper window, I noticed a blurred shape - something tall and thin that could not have been human.

"My grandfather almost abandoned the project," Martin continued. "Then he met someone who recognised what was happening, a specialist in what we might call unusual phenomena. That person helped him understand the junction and how it could be managed."

He turned to a section headed ENCOUNTERS.

Page after page contained accounts much like mine: night guards reporting voices, apparitions and inexplicable sounds.

"The rules aren't arbitrary," Martin said. "Each was written after an encounter. Each one keeps something specific at bay."

He opened another section labelled PERSONNEL.

Photographs of former night guards filled the pages, together with their dates of employment. Many entries bore notes such as terminated, repeated rule violations or resigned.

The ones that frightened me were marked missing.

"What happened to them?" I asked, pointing.

Martin's expression darkened.

"They broke the cardinal rules. They let something in."

He turned to a recent page. Three guards employed within the previous year were all listed as missing.

Beside one name, someone had written: Opened unit F9.

"Jesus," I whispered.

"Now you understand why the rules matter," Martin said, "and why I can't tell every new employee the truth during an interview. Most wouldn't believe me. The rest would walk away."

"And the ones who do believe you, like you..." Martin Blackthorn gave me a tired smile. "They usually fall into two categories. Those who quit immediately, and those who find a purpose in it."

I should have been terrified. I should have handed in my resignation on the spot. But as I went through the records and read stories just like mine, I felt something I had not expected. Everything began to make sense.

The world actually made more sense once I knew there were things beyond what we could see, and rules for dealing with them.

"I want to understand more," I said, surprising myself as much as Martin.

He studied me for a while. "I thought you might. You have good instincts, Callum. Better than most. You knew something was wrong with that man, even though every decent impulse in you would normally have made you help him."

"So what happens now?" I asked.

"That depends on you," Martin replied. "If you want to walk away, I understand. I'll find someone else. The position needs to be filled. The entities are drawn to awareness, and an empty building invites complications."

"And if I stay?"

"Then I'm offering you a promotion. Senior night security officer. Better pay, more responsibility. You'd help train new people and maintain the system my grandfather put in place. It isn't an easy job, but it is an important one."

I thought about my bank account and how hard I had struggled to find work before this. At nineteen, with nothing beyond my A-level results and GCSEs and no vocational experience, GBP15 an hour had seemed extraordinary. Now Martin was offering more, but this time I knew what the job involved.

"I'll stay," I said.

Relief washed over his face. "Good. That's good. There are a few more things you need to know."

He pulled out a fresh sheet of paper and wrote three new rules.

Rule 26: If you see yourself in a mirror when you are not standing in front of one, leave the area immediately.

Rule 27: Never respond if someone calls your full name from behind a closed door.

Rule 28: If the temperature drops suddenly, check the camera feed for unit F9. If the feed shows static, initiate lockdown procedures immediately.

"The entities know you're aware now," Martin explained. "Things will intensify. They'll try different approaches, more sophisticated tests."

I took the paper and memorised the new rules. "I'll be ready."

Martin nodded. "Get some rest today. Your shift starts at 22:00 as usual, but come in at 21:00 tomorrow. I'll show you the lockdown procedure and the other emergency protocols."

After Martin left, I did not go home straight away. Instead, I returned to the reception office and checked the recordings from my previous shifts. I had to see for myself.

The footage from my first night showed me stopping outside unit G4 and talking to what appeared to be an empty storage unit. On camera, I stood alone in an empty corridor, speaking to nothing but air.

The toilet incident was much the same. I went in alone, washed my hands, then suddenly backed away from an empty cubicle before rushing out.

The strangest footage came from the car park and my encounter with the injured man. The camera showed me walking across the tarmac and then stopping for no visible reason. I backed away from nothing, my arms moving as though I were wrenching myself free of someone's grip. My lips moved as I spoke to empty air.

I saved the worst footage for last: unit F9.

I went through hours of video showing the sealed door and the empty first-floor corridor, broken only by the occasional bang that made the metal roller-shutter tremble. Then, at 03:17, something changed.

The door remained closed, but a shadow appeared in the corridor. It was far too tall, with arms so long that its hands hung near its knees and a head that almost touched the ceiling. It stood perfectly still, facing the camera.

Then, slowly, it turned towards the door of F9.

The footage cut to static. When the feed returned one minute later, the corridor was empty. The banging had stopped.

I sat back in my chair, trying to make sense of what I had seen. According to the cameras, I had spent my shifts talking to empty rooms and recoiling from things that were not there. But I had felt the injured man's cold grip. I had heard the elderly woman crying for help.

Then I realised something.

If these things existed in realities that overlapped our own, perhaps I could see them when other people could not. Perhaps that was why Martin thought my instincts mattered. I was seeing them as they really were, not merely the traces they left on camera.

As the sun rose beyond the small office window, I gathered my things and prepared to leave.

I had a great deal to think about. Other realities. Beings that tested us. Rules that kept something very old at bay. This job had become far more than I had agreed to.

A week after my promotion to senior night security officer, I waited in the reception office for the new starter to arrive.

The banging from unit F9 had stopped after that night with Martin, but the silence felt temporary, like something holding its breath. I had spent the week learning the deeper systems of Blackthorn Self Storage. Not merely the patrol routes and security monitors, but the patterns of entity activity, the warning signs of a weakening boundary and the complete lockdown procedure. Martin had given me access to decades of records documenting encounters and incidents.

There was a great deal I needed to pass on.

The front door buzzer sounded at exactly 21:55. On the monitor, I watched a woman in her mid-twenties enter. Her dark hair was tied in a practical plait, and she wore dark cargo trousers with a charcoal waterproof jacket. Sensible choices for a night shift.

Martin had said she came with strong references from her previous job, but it was now my responsibility to decide whether she could cope with what made this place different.

I met her by the entrance and put on my most professional expression.

"Naomi Clarke?" I asked, offering my hand.

"That's me," she replied. Her handshake was firm.

Her eyes moved past me, carefully scanning the reception area.

"So this is the famous Blackthorn Self Storage."

"Famous?" The word caught me off guard.

"Figure of speech," she said with a faint smile. "It isn't exactly a landmark."

I led her to the reception office, noticing how closely she examined everything along the way. She seemed alert and cautious, both valuable qualities here.

"Martin said you'd be handling my training," she said as we entered.

"That's right. You'll shadow me for the first few nights before taking any shifts alone."

I handed her the condensed rule book. It contained the original twenty-five rules Martin had given me at my interview, followed by the three he had added after my promotion.

"The first thing you need to understand is that these twenty-eight rules are not negotiable."

Naomi leafed through the pages without expression. She paused at rule 5, concerning noises from unit F9, and then at rule 17, which instructed us to ignore children's voices after midnight.

"Interesting protocols," she said, looking up. "Is there a particular reason for rules this specific?"

I hesitated, remembering how Martin had handled my induction. New starters were not supposed to learn the truth until they had proved themselves, and until we were certain they could bear it.

"The building has certain quirks," I said, repeating Martin's words. "Following the rules helps you navigate them."

"Quirks," she repeated, with a hint of scepticism. "Such as?"

"Odd noises, cold spots, the occasional unusual occurrence." I turned to the security monitors and changed the subject. "Let me show you the camera system."

For the next hour, I took Naomi through the basic duties: monitoring the feeds, recording entries in the logbook and conducting rounds every two hours. I showed her the master keys kept in the office safe and demonstrated the two-way radios. She asked intelligent questions, took notes and followed closely.

At midnight, I checked my watch. "Time for our first patrol. We'll make a complete sweep of the building, checking each floor from top to bottom."

Naomi clipped the radio to her belt. "Lead the way."

We began on the ground floor, checking units G1 through G20. When we passed G4, I tensed automatically, but no sobbing came from within. I glanced at Naomi.

"Unit G4 sometimes causes problems," I said, keeping it vague. "If you hear an elderly woman asking for help from inside, ignore her and continue the patrol."

"Is there actually an elderly tenant?" Naomi asked.

"No," I answered honestly. "The unit has been empty for four months."

One eyebrow rose. "But I might hear someone inside it?"

"It is probably just the building settling," I said. The lie felt uncomfortable in my mouth. "Old pipes, that sort of thing."

We completed the ground-floor inspection without incident and climbed to the first floor. As we approached the corridor containing unit F9, I guided us towards the stairwell on the opposite side.

"We'll take the long way round," I explained. "Unit F9 is off limits."

"Because of the noises in rule 5."

"Exactly. Under no circumstances should you approach that unit, whatever you hear coming from inside."

I was impressed that she remembered.

The first-floor inspection went smoothly. No banging came from F9. No entities tested our boundaries. Perhaps they were allowing the new starter an easy first night.

We took the lift to the second floor for our final inspection. The S units were smaller than those below, used mainly for documents and other compact items.

The overhead lights hummed faintly as we walked along the corridor, checking doors and making notes. We were almost finished when Naomi stopped near unit S14.

"Did you hear that?" she whispered.

I paused and listened. At first, there was nothing but the hum of the lights. Then I heard it: a soft whimpering from inside the unit.

A child crying.

Naomi moved towards the door, but I caught her arm.

"Rule 17," I said quietly. "Ignore children's voices after midnight."

The crying grew louder and more desperate.

"But what if it really is a child?" Naomi pulled against my grip. "We can't just leave them."

"Trust me," I insisted, tightening my hold. "There are no children in this building."

The sobbing formed words.

"Please help me. I'm scared."

Naomi's face hardened. "Let go of me. There's a child in there."

"It isn't a child," I said firmly.

"How can you be certain?"

The voice became frantic.

"Please, it's dark in here. I can't breathe."

Naomi wrenched free and took two steps towards the unit before I could stop her.

"I'm coming," she called to the door. "Hold on."

"Naomi, no."

I reached for her, but it was too late.

As she approached S14, the crying stopped abruptly. A new sound followed: a wet sliding noise, like something large and damp dragging itself across the concrete floor.

"Hello?" Naomi called, her confidence faltering.

The thing behind the door answered, no longer in a child's voice, but with a high, piercing shriek that made my teeth ache. Something heavy struck the door from within, bowing the metal roller-shutter outwards.

Naomi stumbled back. "What the hell?"

A second blow dented it further. Through the gap beneath the shutter, I saw something pale pushing its way out. Its fingers were too long and thin to be human, with nails curved like hooks.

I seized Naomi's arm and dragged her away as the thing shrieked again. Through the widening gap, a face appeared. At first glance it resembled a child's, but every feature was wrong. Its jaw opened impossibly wide, revealing rows of pointed teeth.

Naomi screamed.

"Run!" I shouted, pulling her towards the lift at the end of the corridor.

Behind us, the door of S14 tore free with a deafening crack. I kept my eyes fixed on the lift and hauled Naomi along beside me. We reached it, and I struck the call button. The doors opened at once, thank God, and we stumbled inside.

As they closed, I saw the thing from S14 emerge into the corridor on all fours, its body bent in ways no living body should have been able to bend.

Naomi pressed herself against the lift wall, struggling for breath. "What the bloody hell was that? What the actual hell?"

Her voice trembled with fear and anger.

I pressed the button for the ground floor, buying us a quicker route to the office. "That is why we follow the rules."

Neither of us spoke during the descent. Naomi stared at me, her face white but her eyes fierce.

When we reached the reception office, I locked the door behind us and checked the monitors. The second-floor corridor was empty now. The shutter of S14 hung twisted from its mountings, but the creature had retreated inside. It had finished making its point about what happened when a rule was broken.

Naomi sank into a chair. Her hands were trembling slightly.

"You knew that would happen."

It was not a question.

I took a deep breath. "I knew something would happen if you approached the door after hearing a child's voice. That is why rule 17 exists."

"So the rules..." she began. "They're designed to protect us from things that aren't human."

"This place isn't what most people think it is."

I expected denial or disbelief, perhaps even an accusation that I had staged the whole thing to frighten her.

Instead, Naomi leant forwards and regarded me with sudden concentration.

"I knew it," she said. "I knew this place was different. That's why I applied."

Now it was my turn to be surprised. "What do you mean?"

Naomi sat back and studied me for a moment before answering.

"My last job was at the Night Owl Cafe, the twenty-four-hour place on Attercliffe Road. We had rules too. Don't serve customers who arrive during heavy fog. Never accept exact change from anyone wearing a yellow scarf. If the unplugged radio starts playing by itself, close early."

I stared at her. "And those rules actually mattered?"

"The night cook ignored the rule about the radio," she said quietly. "We found him the next morning in the walk-in cold room. The police pathologist's preliminary estimate said he'd been dead for days, but he'd only been missing for hours."

I felt the same chill that had gone through me when I learnt the injured man had been dead long before I encountered him.

"When I saw this vacancy with its specific night hours," Naomi continued, "I thought it might be connected. I thought I might find some answers."

"That's why the rules didn't frighten you more."

"Oh, I'm thoroughly frightened by what just happened," she said. "But I'm not surprised that the supernatural exists. I simply wasn't expecting that many teeth."

A short, nervous laugh escaped me. "That was worse than most encounters."

Naomi leant towards me again. "So what is this place, really?"

I told her everything Martin had told me about the junction between realities, the entities that tested boundaries and the rules that kept them contained. She listened without interrupting, occasionally nodding as the pieces fell into place.

"So these entities appear in more than one location," she said when I had finished. "Not only here."

"According to Martin, this facility is unusual because it sits on a major junction point," I explained. "But if what happened at your cafe is related, there must be smaller intersections elsewhere."

Naomi took a small notebook from her pocket and opened it to a blank page. "We should map them. This place, my cafe, anywhere else with inexplicable rules. There might be patterns or connections."

I hesitated, then went to the filing cabinet where Martin had shown me the older records.

"If we're looking for patterns, we should start with these."

For the next few hours, Naomi and I worked through decades of incident reports. We constructed a timeline of manifestations, noting periods of increased activity and comparing the dates and locations.

A pattern emerged. The incidents intensified in cycles, reaching a peak roughly every seven years.

"Look at this," Naomi said, pointing to our chart. "The last major surge was in 2017. Before that, 2010 and 2003."

"Which means the next is due in about three months," I said.

We dug deeper into the archives until Naomi found a report dated 14 November 1970.

"Listen to this. 'All necessary information regarding the containment system can be found in the documentation stored in the auxiliary office behind maintenance.'"

"Auxiliary office?" I frowned. "Martin never mentioned one."

"Perhaps he doesn't know it still exists," Naomi suggested. "This report is more than fifty years old."

I checked my watch. "It's 05:30. Martin will be here in thirty minutes for the shift change. We should put everything back before he arrives."

As we reorganised the files, I realised how quickly matters had changed. Only a week earlier, I had been initiated into the truth of the facility. Now I was bringing someone else into it, someone who had sought this knowledge on her own.

"Do we tell Martin that I know?" Naomi asked as we finished. "Or that we found a reference to a hidden office?"

I considered our next move. Martin had promoted me partly because I could handle the truth, but he had been clear about new starters. They had to prove themselves first.

"Let's wait," I decided. "Give it a few days. Show him you can follow the rules and cope with the entities, then we'll tell him together."

Naomi nodded and tucked away her notebook. "And the office behind maintenance?"

"We'll look for it tomorrow night, during the maintenance check."

The main door buzzer sounded. Martin had arrived. Naomi and I exchanged a look.

We were in this together now.

Martin entered the reception office and glanced at both of us. "Morning. How did the training go?"

"Smoothly," I lied, saying nothing about the entity at S14 or our search through the archives. "Naomi is picking things up quickly."

Martin nodded in approval. "Excellent. Any incidents to report?"

I handed him the logbook, which I had carefully filled with mundane entries. "All clear."

As Naomi gathered her belongings, I saw her glance towards the filing cabinet containing the older records. Whatever answers lay in that hidden office, we would find them together.

Blackthorn Self Storage was no longer merely a job to either of us. It was a mystery we needed to solve.

The maintenance-room door creaked open as I swept my heavy-duty torch through the dust. Naomi followed close behind, her own beam moving over shelves of cleaning products, tool cabinets and electrical panels.

"Where would someone hide an office?" she whispered as she moved further inside.

It was our second night working together. After taking Naomi through the ordinary patrol routes and security procedures during her first shift, we had decided to search for the auxiliary office mentioned in the old report. We needed to find it before Martin arrived for his usual midnight check-in.

"Look for anything unusual," I said, running my hand along the rear wall. "A door that has been painted over, or a section that sounds hollow when you knock."

Naomi searched the right side while I took the left. The maintenance room was roughly 4.5 metres square and crowded with metal shelving and tool cupboards. Nothing appeared out of place.

After ten minutes, Naomi straightened. "Perhaps it was removed during renovations."

I stepped back and reconsidered the room. Something did not add up.

The distance between this wall and the outside of the building was too short.

"The dimensions are wrong," I said, returning to the rear wall. "There should be more space between here and the exterior."

Naomi joined me at the bare concrete. We knocked on different sections, listening for a change in tone. Near the bottom right-hand corner, my knuckles produced a hollow sound.

"There." I pointed. "That sounds different."

Naomi crouched and ran her fingers along the wall. "The paint line changes here. It looks slightly newer."

We felt along the section together until my fingers caught on a small, almost invisible seam. I pressed it, and a rectangular panel shifted inwards by little more than a centimetre.

"Got it," I said, excitement rising.

Naomi helped me pull the recessed panel outwards. It swung open, revealing a dark opening about one metre high.

"They didn't make it easy to enter," she said.

"Probably deliberate."

I crouched and shone my torch through the gap. Beyond it lay a small room containing dust-covered shelves and an old desk.

"We'll have to crawl."

I went first, squeezing through the low entrance on my hands and knees. The air beyond was stale and carried a distinct metallic smell. Once inside, I stood in a space barely large enough for both of us. Naomi followed and pulled the panel closed behind her.

"Bloody hell," she whispered. "I don't think anyone has been in here for decades."

My torch illuminated an office that appeared to have been left untouched for years. A metal desk stood against one wall, buried beneath yellowing papers. Bookshelves on the opposite side were packed with leather-bound journals and old technical manuals. In the corner, the top drawer of a filing cabinet stood slightly open.

"What is all this?" Naomi asked, taking out her mobile phone to photograph the room.

I approached the desk and lifted the first bundle of papers. They were plans of Blackthorn Self Storage, but they included unfamiliar markings: circles centred on unit F9, with lines radiating towards points throughout the building.

"These look like energy-flow diagrams," I said, spreading them across the desk. "And every one of them centres on F9."

Naomi moved to the shelves and removed one of the journals. "This is dated 1952."

She opened it carefully. The stiff pages crackled beneath her fingers.

"Listen. 'Our fundamental discovery is that this location represents a unique focal point at which multiple realities intersect. Initial tests confirm our ability to harness the energy, but containment remains our primary challenge.'"

I picked up a journal dated 1953. "There's more here. 'The entity continues to grow stronger. We have established a basic containment system using the geometric properties planned for the building itself, but it will require constant maintenance and human presence to remain stable.'"

For the next hour, we examined journals, technical papers and hand-drawn diagrams. Edwin Blackthorn's research had begun in 1952, before the three-storey storage facility was completed, and the formal personnel records had begun by 28 October 1963. The more we read, the more we understood, and the truth was far worse than anything Martin had told me.

According to the journals, Edwin had discovered that the land contained a natural weakness between realities. He had designed and built Blackthorn Self Storage around it, using the geometry of the building as a vast containment system for something powerful that existed in the space between worlds.

"Look at this," Naomi said, pointing to a passage in a 1957 journal.

She read aloud. "'The containment must be renewed every seven years through strict adherence to the established protocols. Conscious human observation and deliberate compliance form the foundation of the barrier. When the rules are knowingly obeyed, the boundary strengthens. When they are broken, it weakens.'"

I found a note from 1959. "This says passive presence isn't enough. Whatever is here responds to being perceived - to people seeing it, hearing it or speaking to it. The night guards are supposed to observe the manifestations without giving them what they want. Every time a guard recognises a trap and deliberately follows the relevant rule, it reinforces the containment."

"Callum," Naomi said quietly, "the rules aren't merely protecting the staff. The staff are part of the containment system."

A sick feeling tightened my stomach as I turned more pages.

Martin had never mentioned any of this. He had said the entities were testing boundaries, but not that our awareness and obedience were actively maintaining them.

Naomi found an old leather-bound manual entitled Emergency Protocols and began leafing through it.

"This explains what to do if containment fails. There are diagrams for placing specially marked anchors at precise locations throughout the building, phrases to speak at each position, even contingency procedures for a full breach."

The implication struck me all at once.

"Martin isn't only protecting us. He's using us - everyone who has ever worked nights here - as part of the containment system."

Before Naomi could answer, the concealed panel swung open. Martin crawled through, his face tight with anger.

"What are you doing in here?" he demanded as he stood and brushed dust from his knees.

I held up one of the journals. "Discovering the truth. The whole truth."

Martin looked around at the open journals and the diagrams spread across the desk. His anger drained away, leaving him looking defeated.

"How did you find this place?" he asked.

"We found a reference in the old records," Naomi replied. "Why didn't you tell us what the night security officer position really involved?"

Martin sighed. He suddenly looked much older.

"Would you have believed me? Would anyone take the job if the advert said, 'You'll help contain an interdimensional entity by following bizarre rules'?"

"You have been putting people at risk without their consent," I said, more sharply than I had intended.

"I have been protecting people," Martin countered. "Thousands of them. If what is contained here escapes, the consequences will be catastrophic."

"What exactly is down there?" Naomi asked, pointing to a diagram depicting something immense beneath F9.

Martin went to the desk and sank into the chair.

"We don't fully know. My grandfather called it the Confluence. It is a place where different realities leak into one another. What lies there isn't a single creature so much as a rupture in spacetime, and it grows stronger whenever anyone interferes with it. If it escapes, it could tear permanent doorways between worlds."

I thought of everything I had seen: the elderly woman in G4, the injured man who had been dead for hours, and the child-shaped thing that had attacked Naomi.

"What about the things we keep encountering?"

"Extensions," Martin explained. "Like fingers reaching through from other realities. The rules stop them gaining a foothold. Each rule was developed after an encounter and designed to block a particular manifestation."

"According to these journals," Naomi said, "the containment has to be renewed every seven years. The last cycle was in 2017, so the next renewal is due in three months."

"Exactly," Martin said. "That is why activity has been increasing. As we approach the renewal point, the barriers naturally become thinner."

I looked at Martin, finally understanding that he was more than the manager.

"You aren't just responsible for the facility. You're Edwin Blackthorn's grandson, aren't you?"

Martin nodded. "Edwin Blackthorn was my grandfather. He built this place, established the protocols and created the first rules. When he died, my father took over. When my father died, the responsibility passed to me."

"Why not close the place?" Naomi asked. "Seal it completely."

"That would make things worse," Martin said. "The containment system needs active management. Without conscious human observation and deliberate compliance, the barriers would collapse. The storage business provides cover and income while ensuring that people are always here to maintain the system."

I thought about all the night guards who had preceded me: those who had resigned, those who had been dismissed and those marked as missing in the personnel records.

"How many people have been hurt?"

Martin lowered his gaze. "Too many. But far fewer than would suffer if we stopped maintaining the containment."

"So what happens now?" I asked.

"That depends on both of you," Martin replied. "You know the truth. You can walk away if you wish, and I would not blame you. But I need night guards who understand what they are really doing here."

Naomi and I exchanged a look. Martin had lied to us, and I could not excuse that. But I could no longer ignore the importance of what we were protecting. The rules that had once seemed pointless now made complete sense. They had been built over decades to keep something dangerous imprisoned.

"I'm staying," I said after a moment. "But there will be no more secrets. I want to know everything about the containment system."

"So do I," Naomi added. "And I want to map the links to other locations. The Night Owl Cafe cannot be the only place affected by similar phenomena."

Martin looked relieved. "Thank you. I'll show you everything I know about..."

A low rumble cut him off. The floor trembled beneath us, shaking dust from the ceiling.

"Was that a minor earth tremor?" Naomi asked.

The rumbling intensified. Books toppled from the shelves, and the little office shook so violently that we had to brace ourselves against the walls.

"It isn't geological," Martin said, his face paling.

He dropped to his knees and crawled quickly through the opening. We followed him into the maintenance room and then out into the corridor.

The main security alarm began blaring throughout the building. Red emergency lights flashed overhead as we ran towards the reception office.

The monitors inside showed chaos. Several camera feeds displayed nothing but static, while others showed doors opening and closing by themselves. The temperature had fallen so sharply that my breath misted in front of me.

"Look," Naomi said, pointing to the feed from the first-floor corridor outside F9.

A man stood at the door, trying to cut through the lock with bolt cutters. I recognised him at once. Gareth Webb had worked here as a night guard until Martin dismissed him several months earlier for repeatedly breaking the rules. He had retained detailed knowledge of the site's security, forced a rear fire exit and come deliberately to F9.

"What is he doing?" I asked.

"Getting his revenge," Martin said grimly. "He never believed the rules mattered. He thought they were arbitrary exercises of authority."

On the screen, Gareth finally severed the lock.

As he hauled the door open, bands of static rolled across the picture. We could still see what happened next.

Something immense and black erupted from the unit. It moved with impossible speed and engulfed Gareth within seconds. His body jerked once, then vanished into F9. The roller-shutter slammed down behind him.

Every light in the building flickered at once. The temperature dropped further, and frost spread across the office windows. One by one, the remaining camera feeds dissolved into static.

A voice emerged from the Tannoy system. It sounded like dozens of voices speaking in different languages at the same time. I could not understand the words, but their threat was unmistakable.

Martin staggered against the wall, his face bloodless.

"The containment is failing," he whispered.

The facility seemed to change the instant he said it. The office walls appeared to breathe. The monitors went black, then returned with images of impossible spaces: corridors that had never existed, storage units opening into vast lightless expanses and shadows moving purposefully through the building.

"What's happening?" Naomi asked, her voice steady despite everything.

"Reality is bleeding through," Martin said as he hurried to the emergency panel beside the door. "When Gareth opened F9, he created a primary breach point. The boundaries between worlds are collapsing."

I watched the first-floor feed twist and distort. The corridor outside F9 stretched across the screen, lengthening with every second. Doors appeared in walls that had been bare moments before.

The laws of physics were breaking down inside Blackthorn Self Storage.

"We need the emergency protocols," I said, remembering the leather-bound manual in the hidden office. "The containment renewal procedure. Can we use it to repair this?"

Martin nodded and opened a cabinet I had never noticed before. "We need to perform the full reset. It was intended for the seven-year renewal, but it should work against an acute breach."

He removed a wooden box and set it on the desk. Inside lay seven polished dark slate anchors, each engraved with symbols that seemed to turn and shift whenever I tried to focus on them. Six were of equal size. The seventh was larger.

"These are the anchors," Martin explained, handing three to me and three to Naomi. "The outer six must be placed at precise points throughout the building to reinforce the dimensional boundary."

"The journals mentioned activation phrases," Naomi said, slipping the slate anchors into her jacket pockets.

Martin took a small leather notebook from the box. "Each position has its own phrase. The words are part of a language devised for the containment, and they must be spoken exactly as written while the anchor is placed. There are three phrases, each tied to a pair of opposing positions."

The building shuddered again. On one monitor, a ground-floor unit bulged outwards. Its roller-shutter bent into impossible angles before ripping open. Something dark and fluid poured through, spreading over the concrete.

"We have very little time," Martin said, handing me the notebook.

He turned to Naomi. "Secure three points on the lower level: the main entrance, the east stairwell and unit G4."

Naomi nodded, her expression set with determination.

"Callum, place the other three at the west stairwell, in the ground-floor maintenance room and in the corridor outside F9. I'll prepare the primary containment procedure here."

"What about the seventh anchor?" I asked, looking at the larger piece of slate left in the box.

Martin's expression became grave. "That is the keystone. It must be installed at the focal point of the breach, inside F9."

My stomach tightened. "Inside F9? Where Gareth was taken?"

"Yes," Martin said. "But we have to stabilise the outer boundary first. Go, both of you. We have minutes, not hours."

Naomi and I ran from the office and separated at the first junction. She headed towards the main entrance while I sprinted for the west stairwell.

The building felt wrong around me. The corridor warped slightly with every step, making me dizzy. The air tasted metallic, like blood mingled with the sharp smell after lightning.

When I reached the west stairwell, I took out my first slate anchor and opened the notebook. The phrase assigned to this position was written in a script I did not recognise, with a careful phonetic rendering beneath it.

"Sareth vel, thren aras."

I placed the anchor in the corner where the stairs met the wall and spoke the words exactly.

It took effect at once. The slate sank into the concrete as though it had always been embedded there. A wave of force spread from it, making the air tremble. The stairwell, which had been twisting before my eyes, snapped back into its proper shape.

One placed. Two remaining.

Naomi's voice crackled over my radio. "Entrance anchor set. I used 'Sareth vel, thren aras'. The doors have stopped changing. Heading for the east stairwell."

The matching phrase confirmed that the paired positions had activated as the manual intended.

I made for the maintenance room, trying to navigate corridors that would not remain still. Doors appeared on my right where none had existed before. Through one new window, I saw a black sky filled with unfamiliar stars arranged in patterns that made my eyes ache.

I kept looking ahead and did not stop.

The maintenance-room door remained where it belonged, but when I opened it, the space beyond was twice its proper size. The shelves seemed impossibly distant, and the tools hanging on the walls glowed with a dim blue light.

I found the position marked in the notebook, beneath the electrical panel, and placed the second anchor.

"Orin nael, keth varra," I recited.

My voice echoed strangely through the expanded room. The slate merged with the building. The walls contracted around me, and tools crashed to the floor as the room returned to its normal dimensions.

I barely escaped before the doorway shrank back to its ordinary size.

Two placed. One more before the keystone.

Reaching the first floor was not easy. The stairs changed direction beneath my feet, carrying me first towards the second floor, then down towards an impossible basement that Blackthorn Self Storage did not possess, before finally depositing me on the correct level.

The corridor outside F9 looked completely different. It was at least three times longer than it should have been, and the ceiling rose so high that I could barely make it out. The air felt thick and heavy, as though I were wading through deep water. F9's metal roller-shutter door was the only normal thing in sight. It was closed tight, with no sign of what had happened earlier.

But standing in front of it, I could sense something vast waiting on the other side, pressing against the thin metal.

I took out the third polished slate anchor and found the phrase that matched its engraved symbol.

"Orin vael, thera kest."

As I set the anchor on the floor outside F9, the corridor began to shake violently. The walls bowed inwards.

The lights flickered off, plunging me into darkness, then flashed back on. I fought to keep my footing as I spoke the words, my voice almost drowned by a deep growl that seemed to come from every direction at once.

The slate activated in a burst of cold blue light. The corridor partly returned to normal, although it remained longer than it ought to have been.

The pressure beyond F9's door weakened, but I could still feel it. Whatever waited in there was still trying to force its way through.

I made my way back to the reception office and found Martin bent over the desk, surrounded by open books and unfamiliar tools. The seventh anchor, larger than the others, rested in the middle of a circle drawn with something that smelt of salt and iron.

"Did you place all three?" Martin asked without looking up.

"Yes," I said, struggling to catch my breath. "Naomi?"

"She has just confirmed that her three are in position."

Martin finally raised his head. He looked exhausted, with deep lines cut into his face.

"The outer boundaries are stabilising, but the primary breach in F9 is still expanding. We need to place the keystone."

My two-way radio crackled.

"Callum, Martin, it's Naomi. I can't get back upstairs. The stairwells have changed. I'm trapped on the ground floor."

Martin picked up his radio.

"Stay where you are. The anchors are working, but they are creating a transformation zone. The building is rearranging itself to contain the breach."

"So what is the plan for F9?" I asked.

Martin looked at me, his expression grim.

"Someone has to go inside and place the keystone at the centre of the breach."

"Inside F9? Where that thing took Gareth?"

"Yes."

Martin lifted the final piece of engraved slate and traced one of its disorienting symbols with his finger.

"This will close the primary rupture and reset the entire containment system, but it must be placed precisely at the focal point."

"And the focal point is inside the unit," I said, understanding what he had left unsaid. "Inside whatever took Gareth."

Martin nodded. "I should be the one to go. This is my family's responsibility."

"I'll do it," I said, interrupting him and surprising myself.

"Callum, you don't understand what is in there. The journals call it the confluence, a point where several realities meet. Inside F9, the laws governing matter, time and even consciousness do not function normally."

"But I've seen things other people can't," I reminded him. "You said I have a natural instinct for finding my way through distortions between realities."

Martin hesitated, plainly torn. At last, he placed the keystone in my hand.

It was heavier than it looked, and an unnatural warmth pressed against my palm.

"The activation phrase is here," he said, pointing to a passage in the notebook. "You must reach the exact centre of the breach. You will know it when you see it. Place the keystone, speak the phrase and get out immediately. Once it activates, reality will snap back into alignment. Anything that does not belong in this world will be forced out."

"Including me, if I don't get back through in time," I said.

Martin did not deny it.

The radio crackled again.

"Whatever you're planning, do it quickly," Naomi said, her voice tight with urgency. "The ground floor is changing again. I can see things moving through the walls."

"I'm going now," I said, slipping the keystone and notebook into my pockets.

Martin caught my arm.

"Callum, listen carefully. Once you are inside, you will see and hear things intended to keep you from your purpose. Remember why you are there. Do not let anything distract you. Do not listen to the voices. Above all, do not lose hold of the keystone."

I nodded, trying to appear more confident than I felt.

"Good luck," Martin said, releasing me. "I'll try to monitor your progress, but the radio probably won't work once you're inside."

The journey back to F9 was strange. In some ways it was easier, and in others it was worse. The six outer anchors had made the building more stable, but new impossibilities had appeared in the spaces between them.

I passed an open unit containing an entire desert, its dunes stretching towards a copper horizon that could not possibly exist within the building. Another unit held nothing but absolute darkness, which swallowed the beam of my heavy-duty torch without reflecting so much as a glimmer.

When I reached F9, its roller-shutter door stood open by a few centimetres. Blue light leaked around its edges.

I took a breath, closed my hand around the keystone in my pocket and pulled the door open.

There was no storage unit beyond it. Instead, I saw a churning mass of impossible colours revolving around a point of perfect blackness.

The space was vastly larger than the roughly three-metre-square unit should have been. Gravity had broken down as well. Papers and small objects hung motionless in the air or travelled in slow circles like tiny planets.

I stepped across the threshold. The door slammed shut behind me with a tremendous crash.

Then there was silence. I could not even hear my own footsteps as I moved farther in.

Shadows covered everything. Hundreds of them twisted and crawled across surfaces that should not have existed.

I kept walking towards the darkest point. With every step, the world felt more wrong. One moment my body was so heavy that I could scarcely lift my feet; the next, I was almost weightless. Time misbehaved too.

I blinked and found myself about three metres farther forwards, with no memory of crossing the distance.

Voices whispered all around me. They spoke my name, offered secrets and made promises.

I ignored them and concentrated on reaching the centre.

Something shifted at the edge of my vision. It looked human. When I turned, I saw Gareth, or what remained of him.

He stood perfectly still, translucent as coloured glass, terror fixed upon his face. His head rotated towards me with a smoothness no living neck could manage.

"You can't close it," he said, his voice echoing from several places at once. "It's too late. It's already inside all of you."

I walked past him without answering. The centre was close now, the point from which all the revolving colours and shadows seemed to flow.

"Callum Price."

I stopped.

The voice was not Gareth's. It was not human. It sounded like dozens of voices speaking in perfect unison, and the pressure of it made my head throb.

A figure stood in front of me. It was an exact copy of me, yet every part of it felt subtly wrong. Its smile stretched too far across its face. Its eyes caught a light that did not exist in the darkness.

"You do not need to close the breach," my duplicate said. "You could join us instead. You could see what lies beyond the limits of your reality."

"No, thanks," I said, stepping around it. "I quite like my reality having limits."

The thing wearing my face reached for me. Its arm lengthened impossibly across the space between us.

"You already belong to us. You see what others cannot. That is our mark upon you."

I pulled the keystone from my pocket. The copy hissed and recoiled.

"You belong here," it insisted. Its body flickered between my shape and something else, something with far too many limbs and eyes. "You will never truly fit into their world again."

"Perhaps not," I said, forcing myself onwards. "But it is still my world."

I reached the centre, a patch of darkness that seemed to draw shadows in and drive them out at the same time. Standing beside it, I sensed countless other worlds pressing against that single point, each one straining to break through.

I placed the keystone in the heart of the darkness and opened the notebook.

The activation phrase was longer than the others, written in the same invented ritual language as the outer anchor commands.

"Sael orin, vael thera, kest anor."

As I began to speak, the air changed from freezing cold to blistering heat in less than a second. The colours spun faster.

The shadows began to wail.

My duplicate launched itself at me, its borrowed body dissolving into something monstrous.

I spoke the final word just as its fingers lengthened into claws and reached for my throat.

The keystone sank into the darkness and erupted with brilliant blue-white light.

A wave of force hurled me backwards towards the door. The opening began to close as reality folded in upon itself.

I scrambled upright and ran for the exit while the impossible space collapsed behind me. Papers and objects dropped from the air. Shadows were dragged towards the centre, and the vortex of colours crashed in around the keystone.

I reached the door as the last of the space began to crumple. I wrenched it open and threw myself across the threshold, landing hard on the corridor floor as F9's roller-shutter door slammed behind me.

For several seconds, I could do nothing but lie there and breathe.

The corridor was normal again. It had its proper width, an ordinary ceiling and standard fluorescent lights. I pushed myself upright and watched F9's door glow blue for a moment before fading back to plain grey metal.

"Callum? Callum, come in."

Martin's voice came from the radio clipped to my belt. I fumbled for it with shaking hands.

"I'm here. It's done."

"Get back to the reception office. The containment reset is working, but the building is still stabilising."

I walked through corridors that looked more normal with every step, although tremors still passed through the walls from time to time. When I reached the reception office, Martin and Naomi were waiting for me. Both looked every bit as exhausted as I felt.

"You made it," Naomi said, relief flooding her face. "When the reset began, I thought..."

"What did you see in there?" Martin asked quietly.

I sank into a chair. "The confluence. Gareth. And something wearing my face."

Martin nodded as if he had expected it.

"The entities sometimes imitate people who can perceive them. They are trying to form a connection - a route by which they can cross over."

"It said I already belonged to them," I said. "That seeing them was their mark on me."

"Not exactly," Martin replied. "Your ability to perceive them is natural. You were born with it. It does not mean that you belong to them. It means you can see a truth about reality that most people cannot."

We sat in silence for a while, watching the CCTV monitors as Blackthorn Self Storage gradually returned to normal. Units reverted to their proper contents. Impossible doors vanished. Strange lights faded.

After what felt like hours, Martin spoke again.

"Callum, I want to offer you a formal partnership in running Blackthorn Self Storage and maintaining the containment."

I raised my eyebrows. "A partnership?"

"You've proved more valuable than I could have hoped. Your ability to navigate the distortions, place the keystone and return safely is extremely rare. This place needs someone like you - someone who understands both the danger and the importance of what we are containing."

"And me?" Naomi asked.

Martin gave a faint smile.

"I'd like you to become a partner as well. Your analytical approach balances Callum's instincts. Together, you would make an excellent team for maintaining the boundaries."

I thought about everything that had happened over the past week. I had gone from a desperate nineteen-year-old looking for any work he could find, to a night security officer, then senior night security officer, and now to whatever I was becoming.

Blackthorn Self Storage had changed me. It had opened my eyes to realities I had never imagined. Martin was offering me the chance to protect the boundaries between them.

"I accept," I said at last. "But only if we are honest with every new night guard from now on. No more half-truths about quirks in the building. They deserve to know what they are really guarding before they agree to do it."

Naomi nodded. "Truthful induction, proper supervised training and a clear explanation of what deliberate observation and rule compliance actually do. No one should be used as part of the containment without informed consent."

Martin hesitated, then nodded.

"You're both right. The old approach has failed too many people. From now on, every night security officer will receive a full explanation before accepting the position, followed by supervised shifts and practical emergency training."

"And revised rules," I added, thinking of everything we had encountered. "Some of the old ones need to be clearer, and the new officers need to understand why each one matters."

For the next several hours, while the building settled around us, we wrote the new procedures together. We set out the induction process, the supervised patrol programme, the emergency responses and the right of any recruit to refuse the role after learning the truth.

I began a new rule book, incorporating what Naomi and I had learnt from our encounters with the things inside the building. Rule one remained unchanged:

Never open unit F9.

Many of the other rules were rewritten so that no one could mistake what they meant or why obedience mattered.

By dawn, the crisis was over. On the monitors, Blackthorn Self Storage looked entirely ordinary: a three-storey concrete building filled with other people's possessions.

But I knew the truth now. I understood what waited behind doors and walls that sometimes ceased to exist.

As sunlight entered through the reception windows, I wrote the final lines in the new rule book:

Remember that these rules exist for a reason. They were learnt through loss, hard choices and genuine danger. Your duty is not merely to obey them, but to observe knowingly and act deliberately. That is what keeps the boundaries intact and the things beyond them shut away.

Welcome to Blackthorn Self Storage.