Beneath Blackscar

The car park was empty when I crossed it. It was 18:43 on 26 March 2026, and the Blackscar Caverns visitor centre had been locked up for almost an hour. My left knee wasn't cooperating. Neither were the ribs on that side, the ones I'd cracked on 5 March during a recovery job I never filed paperwork for.

Couldn't. The thing I'd been sent to retrieve, a fossil-like ceramic slab that flexed when touched, had turned out to be heavier than briefed and a lot more interested in staying put. I'd got it to the pickup point eventually. But I'd also been slammed into a limestone shelf hard enough that breathing wrong still felt like someone was testing my bones with a ball-pein hammer.

I didn't go to A&E. Didn't ring in sick. I wrapped the ribs myself with an elasticated crepe bandage from Boots in Ingleton and kept turning up in my maintenance uniform as if nothing had happened. An A&E record would have meant questions about how I'd been injured. Questions could expose the covert work.

That was the deal. You didn't make noise. You didn't draw attention.

You turned up. You did the work. And you kept your mouth shut about what the work actually involved.

Most people at Blackscar Caverns knew me as a maintenance technician.

I had the uniform, the boots and the heavy key ring that jingled from my belt and opened half the doors on the site. I repaired failed lighting rigs along the visitor routes, patched erosion on the paths and changed batteries in emergency beacon stations. That sort of thing. On paper, I worked within an operation overseen by the Yorkshire Dales National Park Authority.

In practice, I worked for a unit buried somewhere inside the Department for Environment, Food and Rural Affairs. It didn't have a name, didn't have a website and didn't officially exist. The job was simple. Straightforward, even. I found things that shouldn't be real. I tagged them.

I moved them to pickup points before anyone else noticed. Then I went back to changing light bulbs and pretending I didn't know what a retrieval lockbox looked like. It paid all right. Not brilliantly, but all right.

Mostly I did it because I was good at it, and because the alternative was going back to a job where nothing I did mattered and nothing I saw made my skin crawl. I'd take the crawling over the boredom.

The limp wasn't obvious unless you were looking for it. I kept my gait even and my weight balanced. The ribs were the bigger problem. Every time I inhaled too deeply, a hot stripe of pain ran beneath my left shoulder blade. I'd learnt to breathe shallowly.

Didn't talk much anyway.

I angled towards the main entrance, keys already in hand. The visitor centre was a low stone-and-brick building with broad windows reflecting the car park lights in flat yellow squares. During the day it was loud, full of families and pensioners buying tickets and asking where the toilets were.

After hours it was just dark glass and locked doors. I liked it better empty.

That was when I saw Nia.

She stood outside the main doors with her hands in the pockets of her warden's waterproof jacket and her shoulders square.

Nia Fenton. Thirty-one. Sandy-blonde hair pulled back tight. Sharp little eyes that didn't miss much.

She'd been an area warden at Blackscar for four years, maybe five. We'd worked together before. Not often, but enough that she knew what I really did.

And I knew she wouldn't ask questions she didn't want answered.

She saw me coming and straightened. Didn't wave. Didn't smile.

Just waited.

I closed the distance, every step measured. My knee complained. I ignored it.

"Euan," she said.

"Nia."

"Got a minute?"

I stopped a couple of metres away, close enough to speak without raising my voice.

"Depends."

She pulled a mobile from her jacket pocket, unlocked it and turned the screen towards me. A missing-person appeal. White bloke, perhaps mid-thirties, wearing a Leeds Beckett hoodie and a nervous smile.

The kind of photograph families gave the police because it was the most recent one they had.

"Martin Vale," Nia said. "Last seen on 22 March near the old show-cave entrance. Told his girlfriend he was going to have a look at the path. Never came back."

She swiped.

Another photograph. Different person. A woman this time, older, with grey hair and glasses.

"Sheila Armitage. Last seen on 20 March. Same area."

Swipe.

Third photograph. Younger bloke, early twenties, woolly hat and a scraggly beard.

"Callum Sykes. Eighteenth of March. Old show-cave entrance again."

I looked at the mobile, then at her.

"Cave rescue?"

"The Cave Rescue Organisation ran a full search operation on the first case, supported by police search teams and dogs. Found nothing. The dogs tracked him to the entrance, then lost the scent."

"Lost it how?"

"Just gone. Like he walked up to the cave and evaporated."

She pocketed the mobile.

"Second case, same thing. Third case, same thing. Dogs reach the entrance and stop."

I shifted my weight off the bad knee.

"You run a grid?"

"Twice. We checked the main routes, the off-path sections, the shake holes. Nothing. No gear, no tracks, no sign any of them went out across the open fell or towards the outlying cave entrances."

"So why are you talking to me?"

Nia's jaw tightened. She reached into her other pocket and brought out a clear evidence bag. Inside was a torch.

Standard black aluminium body, the sort you could buy in any outdoor shop. The lens was cracked. The casing was dented beside the battery cap.

"Found this yesterday," she said. "Maintenance were clearing a sinkhole drain about 800 metres from the old show-cave entrance. It was wedged in the grate."

I took the bag. The torch looked as if it had been dropped from a height or thrown. The crack in the lens spread from a central impact point like a spider's web.

I turned it over. A label on the side had been mostly scraped away. I could just make out part of a name written in permanent marker.

Martin.

"Belongs to the first bloke," I said.

"Yes."

I handed it back.

"Still doesn't explain why you're here."

She didn't take the bag. Instead, she produced a second one. This held something older. Dented metal, blackened by age and corrosion.

It took me a second to place it.

An acetylene caving lamp. A design used by miners and early cavers, with one chamber for water and another for calcium carbide. Let the water reach the carbide and it produced acetylene gas. Light the gas and you had a flame. Simple technology. Reliable. This one dated from the 1930s and had been retired from routine use many decades earlier.

"Found this in the same drain," Nia said. "Same grate. Right beside Martin's torch."

I stared at the lamp. Its metal was pitted and worn, but the form remained intact. Someone had maintained it. Used it.

"That doesn't make sense," I said.

"No," Nia agreed. "It doesn't."

I looked past her towards the dark line of trees and fellside marking the edge of the grounds. The old show-cave entrance was about 400 metres south along a surfaced path used by visitors every day. It was one of the earliest entrances to the Blackscar system, used for decades before the modern visitor routes were developed. A narrow service door remained there, locked and marked "Authorised Personnel Only".

Most visitors never noticed it.

"Where did the dogs lose the scent?" I asked.

"At the service door."

"The one by the old entrance?"

"Yes."

"Anyone check inside?"

"Maintenance did a sweep. Found nothing."

I turned the evidence bag in my hand. The old lamp shifted inside the plastic.

"You want me to go down there."

"I want you to work out what the hell is happening before the Head of Operations has three missing people and no leads landing on his desk." Nia's voice stayed level, but there was an edge beneath it. "If this turns into a press circus, we're finished. The place gets swarmed, we get investigated, and whatever is really happening down there gets buried under civil servants, police command staff and government investigators."

"Or it gets exposed," I said.

"You think that's better?"

I didn't. Exposure meant panic.

Panic meant closure. Closure meant someone higher up the chain would arrive, classify the whole thing and disappear anyone who knew too much. I'd seen it happen once. Didn't want to see it again.

"What's the deadline?" I asked.

"The twenty-eighth of March. Perhaps sooner. The families are already pressing for another large search. If we don't give them something by then, they'll go to the press."

I handed the bag back.

She took it this time, but didn't put it away. Just held it and waited.

I thought about the job. The real job. The one that didn't come with backup, hazard pay or any guarantee that I'd walk out the same way I'd walked in. I thought about the recovery on 5 March, the cracked ribs and the thing that shouldn't have been alive but was. I thought about the three people in those photographs, the ones who had walked up to a cave entrance and vanished.

"I'll need access to the service door," I said. "And I'll need you to keep everyone else out of that section until 28 March."

"Done."

"If I find something, I'm calling it in my way, not yours."

Nia hesitated, then nodded.

"Fine."

"And if this goes sideways, you don't know what I was doing down there."

"Euan, I never know what you're doing down there."

I almost smiled. Didn't, but almost.

She handed me the two evidence bags, Martin's torch and the acetylene lamp. I took them and felt their weight.

Not much. Just enough to matter.

"Anything else?" I asked.

"Yes," Nia said. "Be careful. Whatever is taking people, it isn't leaving bodies."

I knew exactly how ugly quiet solutions could become when things that shouldn't exist were involved. I'd pulled enough impossible objects from enough dark places to know the worst part wasn't the thing itself.

It was what the thing did when it realised you were there.

"I'll bear that in mind," I said.

Nia stepped back, her hands returning to her pockets.

"The doors are unlocked. I'll keep the warden patrols clear until you're finished."

"Appreciated."

She turned and walked towards her dark-green Land Rover Defender at the far end of the car park. I watched her go, then looked down at the evidence bags in my hands. Two objects, one modern and one old, recovered from the same drain, both connected to people who hadn't come back.

I limped towards the visitor centre doors, keys jingling on my belt, ribs aching with every breath.

Just another job. That was what I told myself.

I'd stopped believing it a long time ago.

I didn't sleep much. The ribs made it difficult to find a position that didn't feel as though someone were pressing their thumbs into my side.

Every time I began to drift off, I saw the acetylene lamp on my kitchen worktop beside Martin's torch, both sealed in their evidence bags, both pulled from the same grate.

By morning I'd already made the decision.

I wasn't going in alone.

That wasn't how I usually worked. Most retrieval jobs, I went in solo because that was the contract. And because bringing someone else meant explaining things I couldn't explain.

But this wasn't a retrieval. Not yet.

This was three missing people, two objects that didn't belong together and a service door that had been unlocked for me like an invitation.

I needed someone who knew the cave system. Someone who wouldn't ask the wrong questions.

Someone I had leverage over.

Jamie Rooke owed me money. Not a fortune. Twelve hundred pounds.

But enough that when I messaged him at 07:30 on 27 March and said I had cash work if he wanted it, he replied in under a minute.

"Yeah, mate. What sort of work?"

I kept it simple. Told him I had a pest-control job.

Couple of hours. Cash the same day. Didn't mention the national park, the missing people, the evidence bags or Nia. Didn't mention any of it.

He sent back a thumbs-up and asked when.

"09:30. Visitor centre car park. Bring your work gear."

Jamie was a seasonal cave guide. Twenty-seven, tall, built like someone who climbed and walked the fells for a living. He was good at his job. Enthusiastic. Talked too much when he was nervous.

He'd fallen during an off-path walk the previous summer, split his palm on a rock and fractured his wrist. The injury had kept him off work. Lost wages, private physiotherapy, vehicle recovery and rent had swallowed what little he had. I'd covered the shortfall because he was panicking about losing his flat and his job, and because I thought it might be useful to have someone owe me.

That's me.

Always thinking three moves ahead.

He arrived exactly on time in a battered Mitsubishi L200 pickup with a Leeds Beckett University sticker peeling from the rear bumper. I was waiting by my own vehicle, leaning against it because standing straight still pulled at the ribs.

Jamie climbed out wearing a Leeds Beckett hoodie, cargo trousers and boots that had seen some miles. He had a headlamp clipped to his belt and a rucksack hanging from one shoulder.

"All right?" he said, grinning. "What are we killing?"

"Don't know yet," I said. "Nia asked me to check the back corridors. Something's been getting into the service areas. Probably rats."

"Rats?" Jamie repeated. He looked excited. "Cave rats?"

"Just rats."

"Still interesting."

I handed him a hundred and sixty pounds in cash. Eight twenty-pound notes from the envelope I kept in the glove compartment for situations like this. He took them without counting and folded them into his pocket.

"Cheers, mate. This helps."

"You're good for the rest?" I asked.

He nodded quickly.

"Yeah. I'm picking up extra shifts next month. I'll get you the rest by 1 May."

I didn't think he'd have it by 1 May, but that was fine.

I didn't need the money. I needed him here.

"Let's go," I said.

We crossed the car park towards the visitor centre. It was early enough that the building was still closed to the public. Only a few national park authority Land Rovers and vans stood near the staff entrance. The sky was overcast, a flat grey light making everything look washed out.

Jamie kept pace beside me, talking.

"So Nia just rang you? Or did maintenance put in a ticket?"

"She rang."

"Makes sense. She's good like that. Really on top of things." He adjusted his rucksack. "Is she meeting us?"

"Yes."

"Good. Haven't seen her in a couple of weeks. She still doing those fell patrols?"

"Probably."

Jamie didn't seem to notice that I wasn't giving him much. He kept going, already building the story in his head. I could tell. He had that energy people got when they believed they were doing something they'd talk about later.

It bothered me a little. But it was also why I'd brought him. He'd follow me in because he thought it would make a good story.

And if something went wrong, I wouldn't be the only one bleeding.

Selfish, perhaps.

But I was tired. My knee hurt. My ribs hurt. And I didn't want to walk into that corridor alone.

Nia was waiting by the side entrance near the staff offices. Her warden's waterproof was zipped to the neck and her hair was pulled back, the same as the night before. She looked at Jamie, then at me.

"You brought help," she said.

"Yes."

She didn't argue. Just nodded and took a key card from her pocket.

"Hargreaves has been asking questions."

That stopped me.

"What sort of questions?"

"Inventory. Missing equipment. He came by yesterday afternoon with a clipboard and wanted to know whether I'd signed out any emergency beacons or radios in the past fortnight."

She swiped the key card and opened the door.

"I told him no."

"Did he believe you?"

"Don't know. He smiled, said, 'Thank you,' and wrote something down."

She held the door open and looked at me.

"He's the sort of man who lays traps while pretending to help."

I knew the type.

Graham Hargreaves. Head of Operations. Forty-nine. Neat hair, managerial smile, always in a pressed collared shirt that still looked fresh at the end of the day. He was also my senior manager in the covert unit, although nobody at Blackscar was supposed to know that connection existed.

I'd dealt with him openly on maintenance matters twice before. Both times, he'd asked questions that felt as if he were cataloguing my answers for later. He never pushed. Never accused. Just smiled and filed everything away.

"I didn't take anything," I said.

"I know. But he's watching."

Nia stepped aside.

"Service corridors are through the back. I'll swipe you in, but after that you're on your own. I've got a fell patrol at 11:00."

Jamie glanced between us.

"Wait. Is someone stealing things?"

"No," I said. "Just inventory audits. Happens every spring."

It was a lie, but Jamie accepted it. He nodded and followed me inside.

The staff area smelt of coffee and old carpet. Nia led us down a corridor past the staff room and a couple of offices with closed doors. At the end stood another key-card reader beside a heavy metal door labelled "Authorised Personnel Only".

She swiped her card and the lock clicked.

"This leads to the service corridor behind the heritage route," she said. "It stays locked from both sides. I'm logging your entry as a lighting-system inspection, so if anyone asks, you were checking the lighting grid."

"Understood," I said.

She pushed the door open. Beyond it lay a concrete floor and dim utility lighting beneath a low ceiling. The air smelt damp and mineral, the way it always did near the cave system.

Nia looked at me once more.

"Hargreaves has eyes everywhere. Don't give him a reason to follow you."

"I won't."

She handed me the key card.

"Bring it back when you're done."

I took it and slipped it into my pocket.

Jamie was already stepping through the door, headlamp in hand, looking around as if he'd entered somewhere new and exciting. Nia held my gaze for a second. She said nothing else. Didn't need to.

I nodded and followed Jamie through.

The door closed behind us with a heavy click.

The corridor stretched ahead through concrete and stone, with metal brackets supporting the low ceiling. Self-contained emergency LED units stood roughly every 6 metres, casting long shadows. I could hear the faint hum of ventilation somewhere deeper inside.

Jamie clipped on his headlamp and switched it on despite the working lights.

"This is brilliant," he said. "I've never been back here."

I didn't answer.

I was thinking about Hargreaves. About inventory audits, missing equipment and questions that felt like traps. About the fact that Nia had logged this as a maintenance inspection, which meant there was a record now. If I found something and had to move it, Hargreaves would know I'd been here.

That bothered me.

I'd worked hard to stay beneath his notice. Conducted thirteen retrievals in four years without noise. Logged clean maintenance hours. Kept my head down.

Now I was entering a back corridor with a seasonal guide and a key card that wasn't mine, carrying evidence bags in my jacket pocket that I wasn't meant to have, chasing three missing people and two objects that made no sense.

And Hargreaves was already watching.

I kept walking. Jamie stayed close, his boots scraping the concrete and his headlamp swinging over the walls.

The corridor sloped gently down into the cave system. I felt the temperature falling and the weight of the stone overhead. I knew this route by heart. I'd come through a dozen times for lighting repairs and beacon changes.

But this time it felt different.

This time it felt as if I were walking into something already waiting.

The shift from the visitor centre struck me immediately. All that surface warmth gone, replaced by wet stone, old concrete and air that hadn't moved in hours. Perhaps days.

My ribs didn't like the cold. They tightened on the left side, where the crepe bandage was doing most of the work.

The corridor ran ahead, concrete underfoot, limestone walls close enough to touch on both sides. Metal brackets held the emergency LED units at roughly 6-metre intervals, standard for the site. I'd walked this route perhaps forty times, carrying out lighting repairs and changing batteries.

Knew every bend.

It felt different now, though.

Jamie's headlamp swept the walls despite the fixed units giving us plenty of light. He was doing what people did when excited to be somewhere they weren't usually allowed, staring at everything and touching too much.

"This is incredible," he said.

His voice bounced strangely from the stone.

"I've done about fifty tours and never been back here."

I didn't answer. I was listening.

Ventilation humming somewhere deeper. Water dripping.

That was all.

No footsteps. No voices.

The corridor sloped down towards the access points behind the heritage route. Jamie kept talking.

"Nia really thinks there are rats back here? Seems pretty clean for-"

"Just keep moving," I said.

He managed silence for perhaps ten seconds. Then his boot scraped something and he stopped.

I nearly walked into him. My knee didn't appreciate the sudden transfer of weight.

"Whoa," Jamie said.

He crouched, aiming his headlamp at the floor.

"Mate, look."

I stepped around him and saw it.

Drag marks in the mud.

Not mud exactly. Sediment had built up where moisture seeped through the limestone, leaving a thin layer of grit across the concrete. Maintenance was meant to squeegee it away every few months, but it returned quickly.

The marks ran diagonally across the corridor. Two parallel lines, perhaps 20 centimetres apart, scraped through the sediment to expose clean concrete below.

As if someone had dragged something heavy.

Or been dragged.

Jamie stood.

"That's strange, isn't it?"

"Yes."

"What do you reckon?"

"Don't know."

I stepped beyond the marks, watching the floor now. Nia had said maintenance had already swept this section and found nothing.

But they hadn't been looking for this. They'd been searching for people, equipment, obvious signs.

This wasn't obvious.

About 3 metres beyond the drag marks, I found the first footprint.

I stopped and stared.

Bare. Human-shaped. Pressed into the sediment with enough weight to leave a clean impression.

No boot tread. No sole pattern. Just toes, ball and heel.

Visitors weren't meant to be barefoot anywhere on the site. Certainly not in a restricted service corridor.

"Is that a footprint?" Jamie asked from behind me, his headlamp shining over my shoulder.

"Yes."

"Who the hell walks around back here barefoot?"

I didn't answer because I'd already seen the next print.

And the one after that.

A line of them led deeper into the corridor, spaced like someone walking at an ordinary pace.

I crouched beside the clearest. My ribs protested, but I ignored them.

Up close, it looked worse.

The shape resembled a human foot. Five toes, an arch, a heel. But the proportions were wrong. The toes were too long. Not by much. Just enough that my mind kept trying to correct what I saw.

The arch was wrong too. Too pronounced, perhaps. Or too flat. I couldn't decide. I knew only that it didn't sit right.

It looked like something had studied how human feet worked, then attempted to copy one.

Got most of it right.

Missed the details.

"That is a bloody weird footprint," Jamie said.

He sounded less excited now. Less certain.

I stood. My knee objected.

"Yes."

"Doesn't match any boot I've ever seen."

"It isn't a boot."

"So someone's actually walking around barefoot back here?" Jamie shifted his weight. "That's got to be a safety violation or something."

I didn't answer.

I followed the prints with my eyes. They continued straight down the corridor. Evenly spaced. Deliberate.

The drag marks had been diagonal and chaotic. These were controlled. Purposeful.

That disturbed me more than I wanted to admit.

"Come on," I said.

We followed them.

Jamie stayed close behind me now. No wandering off to inspect brackets or wiring. His headlamp remained fixed on the floor ahead of my boots.

The prints didn't deviate. Didn't stumble or hesitate. They simply continued deeper, where the temperature dropped again and the ventilation hum grew louder.

Then the lights flickered.

We both stopped.

The self-contained LED units dimmed, brightened, dimmed again, then held steady.

"Er," Jamie said. "Is that normal?"

"No."

"I thought these weren't connected to mains power."

"They aren't."

That was the problem. They were battery-powered emergency units. They didn't flicker unless their batteries were failing.

I'd personally replaced half of them four months earlier. They should have had at least another year of service.

The lights flickered again. Longer this time.

They went almost completely dark before returning.

In that half-second of darkness, I heard something farther down the corridor.

Scraping.

Then the lights came back and the sound stopped.

Jamie had heard it too.

"What the hell was that?"

"Don't know."

"Should we-"

"Keep moving."

I didn't wait for him to argue.

I followed the footprints, and after a moment I heard him coming behind me, breathing harder now.

The corridor curved left. The prints followed it.

Then I saw the door.

Narrow. Metal. Grey paint over old steel.

It was set into the limestone wall on the right, in a frame newer than the door itself. I knew it from the maintenance plans. Service access point seventeen.

Locked from both sides. Supposed to lead to a maintenance stairwell connecting with the lower sections of the heritage route.

The footprints led straight to it.

I stopped about 1 metre away and stared.

A keypad had been fixed beside the handle. Black plastic, numbered buttons, its indicator glowing red.

That wasn't standard equipment. Blackscar doors used key cards or physical keys. Had done for years.

The keypad was newer. Aftermarket, perhaps. Someone had installed it without telling maintenance.

That happened occasionally. Hargreaves's people authorised upgrades without routing them through us. Usually, though, I heard about them eventually.

"Is that meant to be there?" Jamie asked.

"Don't know."

"Can you open it?"

I moved closer.

Certain buttons showed wear: 1, 4, 7 and 9. Their plastic surfaces were shinier where fingers had touched them repeatedly.

Four-digit code, probably. Perhaps six.

I didn't have it. Nia's card wouldn't help with a keypad. I could have tried forcing the door, but its frame looked solid and my ribs weren't fit for that sort of work.

I reached out anyway.

My hand moved to the keypad and my fingers tapped four numbers.

1. 7. 4. 9.

I didn't think about it. Didn't plan the sequence.

My hand just knew.

The indicator flashed green. The lock clicked.

I pulled my hand back and stared at it.

"Nice," Jamie said behind me. "How did you know the code?"

I didn't.

That was the problem.

I'd never used this door. Never been given a code. Hadn't even known it possessed a keypad until thirty seconds earlier.

But my fingers had known the sequence. They'd moved through it smoothly and automatically.

Muscle memory.

That bothered me more than if the door had remained locked.

I pushed it open. The hinges moved silently.

Too silently.

Someone had maintained them recently.

Beyond lay a narrow stairwell. Concrete steps descended into the dark. A metal handrail was bolted to the left wall, and new wiring ran along the ceiling inside plastic conduit.

At the top of the stairs, mounted where anyone climbing them would walk directly into its view, was a security camera.

Cheap model. Black plastic dome. A single red LED beneath it blinked slowly and steadily.

Not park authority equipment. We didn't install cameras in service corridors. Too expensive for places the public never saw.

Someone else had put it there.

Someone who wanted to know who passed through that door.

Jamie saw it too.

"Is that a camera?"

"Yes."

"Who installed it?"

"Don't know."

He looked at me.

"Should we... I mean, are we meant to be on camera?"

"Probably not."

But we were already there. The door was open.

And the footprints led somewhere.

I stepped onto the landing. My boots scraped the concrete. The stairwell smelt of damp stone and something else.

Chemical. Cleaning fluid, perhaps.

Jamie hesitated in the doorway.

"Euan, mate, this feels wrong."

It was wrong. All of it.

The keypad code I shouldn't have known. The camera that shouldn't exist. The wiring absent from every maintenance log I'd seen.

But three people were missing and their trail led here.

"You can go back," I said. "Leave the door open. I'll be up in ten minutes."

He stood there for several seconds.

Then he stepped through and pulled the door shut behind him.

The lock clicked.

We both looked at it.

"Can we get back out?" Jamie asked.

I didn't know. I hoped the keypad worked from both sides.

The camera blinked above us, recording everything and sending its signal somewhere.

I looked down the stairwell. The steps sank into darkness beyond the end of the new wiring and the reach of the light.

"Stay close," I said.

Then I started down.

I could have turned back. Should have. Probably.

The stairs kept descending and I kept following them. One hand rested on the rail. The other held my torch, despite the weak light still reaching us from the landing.

My ribs pulled with every step and my left knee didn't like the angle, but I didn't stop. Jamie remained close behind. I could hear his breathing and the scrape of his boots on concrete.

I told myself I could turn round at any point. Walk back up. Tell Nia this was beyond the scope of maintenance and she needed to escalate through official channels.

File a report. Bring the Cave Rescue Organisation back in properly, with police search teams and dogs. Call the National Crime Agency if the camera and keypad meant what I thought they meant.

That was the sensible move.

Except official responses created records. Records were filed, copied and passed up chains of command. Someone read them and decided they were interesting.

Then the unmarked black 4x4s arrived at night to collect whatever I'd tagged.

Sometimes the people inside asked how I'd found it, what I'd seen and whether anyone else knew.

Thirteen retrievals in four years. Every one the same.

Same vehicles. Same lack of identification. Same instruction to forget the coordinates after handover.

I didn't want to become the subject this time instead of the contractor.

So I kept descending.

The wiring ended about twenty steps down. After that, only my torch and Jamie's headlamp cut through the darkness.

The air grew colder. I could see my breath.

Thirty steps. Forty.

The staircase finally ended at a smooth concrete landing and a doorway cut into raw limestone. There was no door in the frame. Just an opening into the passage beyond.

I stopped at the threshold and swept my torch across it.

A broad passage, roughly 4.5 metres wide and 3 metres high. Concrete ribs crossed the ceiling at regular intervals, thick and industrial. The sort of structure you'd expect in a bunker or air-raid shelter.

Not a natural cave formation.

Not 1930s Ministry of Works construction either. I'd seen plenty of that around old sites, and this wasn't it.

The walls were limestone, but someone had poured concrete footings along their bases and patched higher sections with newer cement that didn't match the colour or texture of the old work.

The patches were clean. Recent.

I stepped through.

Jamie followed, his headlamp moving left and right.

The passage continued straight for roughly 15 metres before bending out of sight. Self-contained emergency LED units hung from the ceiling ribs at intervals of about 6 metres, matching those in the corridor above.

These were all lit and steady.

No flicker.

I moved forwards slowly, examining everything.

Three metres in, I spotted the supplies. Four pallets stacked two high against the right side of the passage. Sealed water containers, dusty but intact, beside stacked decontamination supplies.

Against the left wall stood two yellow NHS-style clinical-waste bins with foot-pedal lids and hazard markings.

Both were closed.

I didn't open them.

Jamie stopped beside the pallets.

"What the hell is this?"

"A worksite," I said.

"For what?"

I didn't answer because I didn't know.

But someone had carried supplies down here. Someone had poured concrete, installed wiring, lights and cameras, and built inside a section of the cave absent from every visitor map. Behind locked doors fitted with keypads whose code I knew without knowing why.

I kept walking.

More equipment appeared as I rounded the bend. A folding table with two metal chairs. A wheeled tool chest, the kind used by mechanics, every drawer shut. A portable generator standing silent with its fuel cap secured. Nearby waited a wheeled CO2 extinguisher intended for the generator and electrical equipment.

No people.

No sound except our boots and breathing.

I swept my torch over the ceiling and walls, searching for more cameras. Didn't see any.

That didn't mean they weren't there.

Jamie caught up.

"Euan, we need to get out and call someone."

"Yes," I said.

I didn't move.

The passage continued into a darker section where the emergency lights either hadn't been installed or weren't working. I could see the edge of another pallet, something large beneath a tarpaulin, and a man.

I stopped.

He sat perhaps 12 metres ahead, just beyond the last working light, in a wheeled office chair. His back was towards us, but I could see his arms drawn behind the chair and his ankles taped to its legs with silver duct tape.

Dark trousers. Pale shirt.

Not moving.

I raised my torch and advanced quickly, ignoring the pull in my ribs. Jamie said something behind me, but I wasn't listening.

When I got within 3 metres, the man's head turned. Not all the way. Just far enough for the side of his face to enter my beam.

Swollen. Split lip. Bruising across one cheekbone. Salt-and-pepper hair disordered. Pale hazel eyes blinking against the light.

Graham Hargreaves.

Head of Operations. My senior manager. The man who had questioned Nia about missing equipment the day before. The man who smiled while setting traps.

He was tied to a wheeled chair in an unmapped passage beneath Blackscar Caverns, his face apparently beaten, his ankles secured with duct tape and his hands behind his back.

But the bindings were neat. Almost arranged. There were few scuff marks around the chair, none of the disorder I'd expect from a real struggle, and the damage to his face looked superficial beneath the swelling.

He saw me and made a sound.

Relief, perhaps.

Desperation.

"Price," he said.

His voice was rough and thick.

"Jesus. Thank God."

I stopped walking and kept the torch trained on him.

Jamie moved beside me and drew a sharp breath.

"Bloody hell. Is that-"

"Hargreaves," I said.

"We have to help him."

Jamie started forwards. I put out a hand and caught his shoulder.

"Wait."

Hargreaves's eyes moved to Jamie, then returned to me.

"Please. You have to get me out of here. They grabbed me. I was trying to document..."

He stopped, swallowed and winced.

"There's illegal activity beneath the site. I found evidence. I was going to take it to National Crime Agency investigators, but they seized me before I could get out."

The words came quickly, with practised panic behind them.

He pulled at whatever held his hands behind the chair. The chair rocked slightly, but the restraints stayed conspicuously tidy.

"Who grabbed you?" I asked.

"I don't know. Two men. Masks. They hit me, dragged me down here and tied me up."

He looked at Jamie again.

"Please. We need to leave. They could come back."

Jamie pulled against my hand.

"Euan, come on."

I didn't let go. I stepped closer to Hargreaves, keeping my torch on him, and looked at his hands. They were cable-tied behind the chair. I could see the white plastic loop around both wrists, pulled snug but not cutting into the skin.

His fingers were relaxed. No friction burns, no blood, no dirt. Too clean. I looked at his ankles.

Silver duct tape bound both legs to the chair supports. Six or seven turns around each. Neat. Even.

The sort of careful job you did when you had time and weren't in a hurry. The tape ends were tucked under, not torn loose. I crouched despite my ribs and examined the floor around the chair. Clean concrete.

No scuff marks. No sign of a struggle. Hargreaves watched me.

"Price, what are you doing? We need to move."

I stood and looked at his face again. The swelling was real. The split lip was real, but the bruising looked superficial. No deep tissue damage. No swelling around the eyes or nose to match the sort of beating that would split a lip that badly.

Staged.

The word landed in my head and stuck. This was staged. I took a step back. Hargreaves's expression changed.

Still desperate, but with something else beneath it. Calculation, perhaps.

"Price," he said quietly. "I know you don't trust me. That's fine. But three people are missing, and I found out why. There's something down here. Something they're hiding.

"I tried to stop it, and this is what happened." He pulled against the cable tie again. "You can leave me here if you want, but at least tell someone where I am."

Jamie looked at me.

"Euan?"

I didn't answer. I was thinking about the keypad. About my fingers knowing the code without me knowing why. About the camera recording us.

About Hargreaves questioning Nia about missing equipment the day before, and now Hargreaves tied to a chair in a passage that shouldn't exist. About how convenient it was that we had found him.

I opened my mouth to say something.

A hiss slid out of the darkness behind Hargreaves. Long and wet. Not mechanical. Not wind moving through a crack.

Organic.

I swung my torch towards the sound. The beam cut past Hargreaves's chair and into the section of passage beyond the utility lights. Something moved. Tall, thin, wrong.

It stood between two limestone pillars about 9 metres away, just at the edge of my fading beam. The shape made no sense. Too tall. Its proportions were wrong. It moved sideways, smooth and fluid, and I saw limbs bending at angles that shouldn't have existed.

The hiss came again. Jamie's headlamp beam joined mine. Both of us lit the same section of passage.

The shape stopped moving.

It stood there, watching. I couldn't see any details. Only the silhouette.

Only the wrongness.

Hargreaves went completely still in his chair. His breathing stopped. The shape tilted its head.

Then it stepped forward into better light.

I backed away. Didn't think much about it. Just moved.

Jamie matched me step for step, his headlamp swinging wildly across the ceiling. The thing in the darkness tilted its head again, and I didn't wait to see what it did next. I grabbed Jamie's sleeve and pulled him towards the stairwell.

"Move," I said.

He moved. We reached the bend in the passage and I shoved him ahead of me. My left knee screamed and my cracked ribs felt as though someone were twisting them, but I kept going. The generator was still there. The folding table. The sealed water containers, two yellow NHS-style clinical-waste bins and the stacks of decontamination supplies.

Everything exactly where we had seen it two minutes earlier.

Behind us, something scraped against stone. Long and deliberate.

Jamie reached the doorway first and took the stairs at a run. I was directly behind him. My boots slammed against the concrete, every step sending a fresh jolt through my left side, but I didn't slow. Jamie's headlamp lit the stairs ahead in jerking bursts.

Twenty steps. Thirty. The new illicit cabling appeared along the ceiling, separate from the self-contained emergency LED units, and I knew we were close.

Then the door at the top slammed shut.

The noise punched through the stairwell. Metal on metal. A hard, flat bang that echoed down and struck us twice.

Jamie stopped so sharply I nearly ran into him. He stared up at the closed door, breathing hard, then looked back at me.

"Did you-"

"No."

I pushed past him and took the last ten steps two at a time. My left knee buckled on the landing, but I caught the handrail and stayed upright.

The door was right there. The same grey paint. The same handle. The keypad beside it still showed a red LED.

I seized the handle and pulled. Nothing.

I pulled harder and threw my right shoulder into it. The door didn't move. It didn't rattle or give even a millimetre. Jamie came up behind me.

"Try the code."

I entered 1749.

The LED remained red.

"Fuck," Jamie said.

I crouched and ran my hand along the frame. The metal felt wrong. Too smooth. Too warm. I aimed my torch at the join between the door and the frame.

There was no join.

The gap had vanished, filled by something resembling fresh weld beads running the full height of the frame. Top to bottom. Continuous.

The metal was still warm.

"It's sealed," I said.

Jamie leaned closer. "What?"

"The frame. It looks as though someone's welded it shut."

"That's impossible. We came through it five minutes ago."

I stood. My ribs were on fire.

"I know."

Jamie grabbed the handle and yanked. Then he kicked the door three times, hard. His boot left scuff marks in the grey paint, but the door didn't move.

"Hey!" he shouted. "Hey! We're trapped in here. Open the door!"

His voice bounced off the concrete and came back at us.

No one answered. I caught his arm.

"Stop. We need to-"

He pulled against me.

"Stop," I said again. "Keep quiet."

He stopped and looked at me. His face was pale beneath the headlamp, his eyes too wide.

"We're locked in."

"Yes."

"What do we do?"

I didn't answer. I was listening.

Something clicked inside the walls, faint but steady. Three clicks, a pause, then three more. Too rhythmic for dripping water. Too regular for settling stone.

Jamie heard it too.

"What is that?"

"I don't know."

"Bats?"

"No."

The clicking continued. Same pattern. Same intervals. It sounded deliberate, purposeful. The sort of rhythm used to mark time or transmit a signal.

From below, past the doorway into the passage, Hargreaves made a sound. Not a word. A strained noise somewhere between a grunt and a laugh.

I turned and looked down the stairwell. Jamie's headlamp followed my gaze.

Hargreaves was still in the chair where we had left him, hands cable-tied behind his back and ankles taped. But he was smiling now, so widely that his lip had split further. A thin line of blood ran down his chin.

"The cave doesn't belong to the national park authority any more," he said.

His voice carried clearly up the stairs. Calm. No panic. No fear.

I didn't move.

"Do you want to tell me what that means?" I said.

Hargreaves tipped back his head and gave a short, sharp laugh.

"You've been useful, Euan. More than you know."

Jamie looked at me.

"You know this bloke?"

"He's my senior manager."

"He doesn't look very well managed."

Hargreaves continued.

"Those night retrievals you've been doing. The unmarked black 4x4s. Crates labelled as geological equipment. You thought you were working for Defra, didn't you? Some off-book government retrieval unit?"

Something cold settled in my chest.

"You weren't," Hargreaves said. "You were working for us. Every tagged object, every retrieval, every coordinate you logged and forgot. It all came straight back here."

The clicking inside the walls continued. Three clicks, pause, three clicks.

"You're lying," I said.

"Am I?"

Hargreaves leant forward as far as the restraints allowed.

"How many sublevel access points have you visited in the past six months? How many keypads have you opened without thinking? And across four years, how many retrievals? Thirteen?"

I thought of the door above us. The way my fingers had moved by themselves. 1749, without hesitation. As though I had entered it a hundred times.

But I hadn't.

Or I had, and didn't remember.

Hargreaves saw something change in my face.

"There it is. You're beginning to understand."

Jamie looked from him to me.

"Understand what?"

I ignored him. My mind was moving too fast. Everything felt sharp and wrong. The keypads. The doors. The muscle memory I shouldn't have possessed.

Someone had trained me.

Not through a manual or a briefing. Through repetition. Over and over until my hands knew the codes without my conscious mind being involved. Pavlov's dog. Ring the bell, get the food. Open the door, tag the object, forget the location.

The fossil-like ceramic slab that had flexed when I touched it. The other things sealed in crates. Thirteen retrievals in four years, each one feeding this place.

I had been conditioned.

"You bastard," I said.

Hargreaves's smile widened. Blood dripped from his chin onto his pressed collared shirt.

"You were perfect for it. Already cleared, already isolated, already willing to do the work without asking questions. All we had to do was ensure you kept opening the correct doors at the correct times."

The clicking stopped.

Jamie drew a folding knife from his pocket.

"I'm cutting him free."

"Don't," I said.

"We need to get out, and he knows-"

"Don't touch him."

But Jamie was already moving. He hurried down the stairs and crossed to Hargreaves's chair. I started after him, but my left knee failed on the third step and I had to catch the handrail.

"Jamie, stop."

He didn't. He flicked open the knife and cut through the cable tie around Hargreaves's wrists. Two quick strokes. The plastic fell away.

Hargreaves slowly brought his hands in front of him, rubbed his wrists, then looked up at Jamie and smiled.

"Thank you."

Jamie crouched and began cutting through the duct tape around Hargreaves's ankles.

"Can you walk? We need another way out."

"I can walk," Hargreaves said.

The last loop came free. Hargreaves stood, swayed slightly and put one hand on Jamie's shoulder as if he needed support.

Then his posture changed. Straightened. Locked into place.

His other hand went into his pocket and emerged holding something small and black. A slim plastic remote with one red button.

I was halfway down the stairs.

"Jamie, move."

Jamie looked at me, confused.

Hargreaves pressed the button.

A sharp smell struck me at once. Clean and chemical, something like bleach but more acrid. It rose from the floor in a wave, and my eyes began streaming before I understood what was happening.

Mist poured from narrow vents cut into the concrete. Thin white streams spread rapidly and low across the chamber floor.

My throat burned. My eyes burned worse. Jamie stumbled backwards from Hargreaves, coughing so violently that he doubled over.

The mist kept coming. It was already around our ankles and rising. I pulled my shirt over my nose and mouth, but it did little. Whatever it was, it was getting through.

My lungs tightened. My sight blurred.

Hargreaves stood in the middle of it without coughing. A small filter plug was fitted discreetly inside each nostril, and I saw him work something beneath his tongue before slipping the remote back into his pocket. Antidote, conditioning or both. Whatever protected him, the trap had been prepared in advance.

He looked at me through the thickening mist.

"You should have stayed upstairs, Euan."

Jamie dropped to his knees, still coughing. His headlamp swept across the floor and lit the mist from beneath. I tried to move towards him, but my legs weren't working properly. Everything felt slow and distant.

The stairwell behind me. The passage ahead. Hargreaves standing there and watching.

The mist climbed to my waist. My knees folded. I struck the concrete hard and felt something shift in my cracked ribs, but the pain was muffled and far away.

Jamie lay on his side, no longer moving.

The last thing I saw before my vision went black was Hargreaves walking towards us through the mist, steady and calm, as though he had all the time in the world.

Then there was nothing.

No clear interval. No sense of waking. One moment was blackness, and the next the overhead utility lights were burning steadily above me. The mist lay shallow across the floor, and I was upright without remembering how I had risen.

The thing stepped fully into the light.

I don't know what else to call it.

It wasn't human, but it was trying to be. It stood a little over 2 metres tall, perhaps more, with proportions that hurt my eyes to follow. Its arms were too long. Its legs bent at joints that shouldn't have existed.

Its skin, if that was what covered it, looked wet. Like clay someone had forgotten to smooth. Grey-white and slick, catching the overhead light in a way that made it seem to move even when the creature stood still.

The face was the worst part.

It had eyes. A mouth. Something that might have been a nose.

But they didn't align properly. The eyes were too far apart, then too close, then settling somewhere between, as if it couldn't decide. Its mouth opened and closed without sound. Lips peeled back over teeth that looked almost human, except there were too many.

And its eyes reflected.

Not like an animal caught in headlights. As though something behind them were glowing. Yellow. Pale and sickly.

Its feet matched the prints we had found in the corridor. Long and flexible. Toes bent and gripped the concrete like fingers.

It tilted its head and watched us.

I couldn't move.

Jamie's headlamp beam remained fixed on it. I heard him breathing quickly through his nose.

Behind us, Hargreaves laughed. Not loudly. Just a low sound in his throat that made my skin crawl.

"The mist makes them compliant," he said.

His voice was steady and calm, as though he were explaining a process during a safety briefing.

"It suppresses the panic response. Keeps them cooperative. They follow instructions. Walk where they're told. They don't fight."

I looked down. The white mist remained ankle-deep, spreading across the floor.

"And it learns," Hargreaves continued. "Every contact. Every interaction. It studies movement, speech patterns, facial structure. It improves a little each time."

I thought about the footprints and drag marks. Martin Vale, last seen on 22 March 2026. Sheila Armitage, missing since 20 March. Callum Sykes, unseen since 18 March.

They hadn't run. They hadn't screamed. They had walked down here breathing the mist and followed that thing deeper into the cave until it no longer needed them.

Jamie stepped forward.

I caught his arm.

"Don't."

He didn't answer. His eyes were unfocused, fixed on the creature. His headlamp beam drifted lower.

"Jamie."

He took another step. He pulled against my grip, not violently, just steadily, like a sleepwalker.

I hit him. Not a slap. A proper punch, my closed fist striking his shoulder hard enough to turn him halfway round.

He stumbled, blinked twice and snapped back into focus.

"What the-"

"Stay behind me."

I pulled my shirt over my nose and mouth again. It didn't help much. The mist still burnt my throat, but perhaps it bought me a few seconds.

I dragged Jamie backwards towards the stacked water containers and decontamination supplies. My left knee screamed. My ribs felt as though someone were driving nails through them.

I didn't care.

The creature took another smooth, fluid step. Its head tilted the other way.

Jamie's rucksack was still on his shoulders. I shoved him down behind the nearest stack and searched its main compartment. Batteries. Protein bar. First-aid kit.

There.

A spare headlamp. Cheap plastic. Three settings.

I switched it to strobe. White light flashed every half-second. I held it above the containers.

The creature stopped.

Its head jerked. Those wrong, yellow eyes acquired the light, lost it, then found it again. It stepped backwards.

"It needs continuous input," I said, mostly to myself. "The interruptions are overloading it."

It wasn't proof of some universal weakness. The intermittent light was simply disrupting its attempt to track us, forcing its senses to begin again with every flash.

Hargreaves was moving. I caught him in the edge of my vision. He was crossing towards the left wall, past the folding table, heading for something I couldn't see.

I set the strobing headlamp on top of the containers, aimed it at the creature and went after him.

My left knee failed on the third step. I hit the concrete, pushed myself up with both hands and kept moving.

Hargreaves reached the wall. A grey metal panel sat flush within it. He pulled it open.

I tackled him from the side.

We went down hard. My right shoulder took most of the impact, and something tore deep inside the joint. Hot pain flooded down my arm.

Hargreaves rolled with the fall, came up on top and drove an elbow into my cracked left ribs. I heard myself make a sound I didn't recognise.

He fought like someone trained. Efficient. No wasted movement. He planted a knee on my chest and reached into his pocket.

The remote.

I bit his hand.

Not a nip. I clamped my teeth into the flesh between his thumb and forefinger and felt the skin break.

Hargreaves shouted. The remote struck the concrete and skittered about a metre away.

I shoved him off, rolled and grabbed it. My right shoulder wouldn't work. I used my left hand.

The creature was closer now, perhaps 6 metres away. It was moving towards the strobing light as though trying to understand what it meant. Jamie remained behind the containers, pale and shaking.

I pushed the remote into my pocket and took out the evidence bag containing the dented, blackened acetylene caving lamp. It dated from the 1930s and had been retired from routine use many decades earlier.

I twisted off the sealed lower chamber. A small quantity of calcium carbide remained inside. Ancient, but dry. Grey-white lumps with a sharp chemical smell, preserved from moisture by the seal.

Hargreaves was getting up. Blood ran from his hand.

I caught him by the collar, dragged him close and shoved some of the carbide into his mouth. He gagged and tried to spit it out.

I held his jaw shut.

"Bite down."

He refused.

I took out my cheap, half-empty lighter. I flicked it once, and the flame caught.

Hargreaves's eyes widened.

He bit down.

Moisture triggered the carbide. There was no explosion, only a sharp hiss as acetylene formed and a brief flare of heat near the lighter flame.

Hargreaves jerked away, coughing and spitting white fragments across the concrete.

The creature recoiled with startling speed. It swept backwards about 3 metres in one fluid motion and pressed itself against the limestone wall.

Fire. Or heat. Or the chemical reaction itself. It had shown an immediate aversion, but I didn't know why and didn't care.

I looked around.

The generator stood about 4.5 metres away. Beside the folding table and the yellow clinical-waste bins, against the far wall, was a wheeled red cylinder with a black hose and discharge horn. A CO2 extinguisher provided for the generator and electrical equipment.

I ran for it. My left knee gave way halfway there.

I landed on my hands, pushed up and kept moving. The cylinder weighed about 14 kilograms. I dragged it back towards the stacked containers, pulled the safety pin and squeezed the operating lever.

White CO2 flooded across the floor. Heavier than air, it rolled over the concrete in a thick wave, displacing and thinning the compliance mist immediately around us.

It was a desperate tactic, not breathable air. In a confined cave, enough CO2 could render us unconscious or kill us. We had seconds at most.

Jamie coughed hard. Then again. His eyes focused.

"Euan, what-"

"Get up."

He stood. His legs shook, but held.

The creature began moving again, slowly and cautiously. Its head swivelled between Jamie, me and the strobing light still flashing from the top of the containers.

I grabbed the headlamp, shoved it beneath a wheeled tool trolley and pushed.

The trolley rolled slowly away, its castors squealing. The creature followed the flashing light, trying and failing to hold it in a continuous track.

"Run."

We ran.

Past Hargreaves, still on his knees coughing. Past the folding table and the generator.

A narrow side passage opened beyond them. I had seen it earlier and ignored it because it didn't lead towards the stairs. Now I noticed the arrows. Fresh white paint, pointing along the passage towards something I couldn't see.

I didn't care where it went. Anywhere was better than there.

Jamie reached it first. I followed.

The passage bent left, then right. The ceiling dropped to a little over 2 metres. The walls closed around us.

Then I saw a metal hatch set into the floor, secured by a wheel lock.

I dropped to my knees and grabbed the wheel. It wouldn't move.

Jamie knelt beside me. Together we hauled on it. The wheel turned slowly, grinding, then moved faster. The hatch lifted.

Darkness below. The smell of oil and dust.

We dropped onto a narrow service ledge inside a maintenance lift shaft. Ladder rungs were bolted to the wall at intervals of about 30 centimetres. They rose above us into darkness. Far below the ledge, the shaft fell away into nothing.

"Up," I said.

Jamie stared at me.

"Up," I repeated. "We climb."

He nodded, reached for the ladder and began ascending. I followed.

My torn right shoulder screamed with every pull, forcing me to do most of the work with my left hand despite the pain in my ribs. I didn't stop. Rung after rung. Hand over hand.

Jamie climbed above me. The lower hatch remained open beneath us.

Something scraped down there. Wet and deliberate.

I climbed faster.

Jamie's breathing became ragged. The old metal rungs tore into his palms. Dark smears began appearing beneath his hands.

"Keep going."

He did.

I don't know how long we climbed. Five minutes, perhaps ten.

Then Jamie stopped.

"There's another hatch."

"Open it."

He pushed upwards. Metal scraped against metal. He grunted, braced himself and shoved hard.

The hatch flew open. Pale light spilled down the shaft.

Night air.

Jamie pulled himself through. I followed and collapsed onto cold concrete as the hatch fell open behind us.

We were inside a maintenance store in the surface yard.

I recognised the smell. Diesel, old timber and fertiliser.

Jamie was on his hands and knees, coughing. His palms were split open now, blood dripping onto the concrete.

I sat up. My right shoulder was useless. The joint felt packed with broken glass.

Outside, I heard sirens. Police vehicles, not national park authority Land Rovers or vans. Above them came the steady thump of helicopter rotors.

Someone had begun the containment response before we surfaced. The hidden camera or an alarm in the complex must have alerted them.

I stood, took three steps and pushed open the store door.

A gravel service road. Trees. Darkness. Headlights approaching fast.

A dark-green Land Rover Defender stopped about 6 metres away. The driver's door opened. Nia stepped out with a heavy torch in one hand and an issued irritant spray in the other. Armed North Yorkshire Police officers were immediately behind her, covering the yard.

She swept her torch across the area, saw me, then Jamie behind me, and lowered the spray.

"What happened?"

"Hargreaves was involved," I said.

My voice sounded wrong. Too flat.

"There's something beneath Blackscar. Mist pumped through vents. It makes people compliant. And there's a creature. It mimics human features. Learns through contact."

Nia stared at me for three seconds. Then she clipped the spray away and opened the rear door of the Defender.

"Get in."

Jamie climbed in first. I followed.

Nia drove without headlights, fast, down the service road, through a gap in the fence I hadn't known existed and onto a fire-service access track.

She didn't speak. Neither did I.

After about ten minutes we reached a B-road. Ahead were police cordons, traffic cones, reflective jackets and vehicles with blue light bars.

Nia slowed and stopped.

A North Yorkshire Police constable approached. In his thirties. Solidly built, with short light-brown hair.

PC Owen Cartwright. I had seen him at an incident in the national park two years earlier.

He looked at Nia, then at Jamie and me in the back.

"Warden Fenton."

"PC Cartwright. I've got two coming out. A maintenance contractor and a seasonal guide. They were carrying out a lighting repair when the alarm sounded."

Cartwright looked at me, then at Jamie's bloody hands.

"Do they need medical attention?"

"The ambulance is fine."

Cartwright nodded and waved us through.

We passed the cordon. Roughly 100 metres farther on, a Yorkshire Ambulance Service ambulance stood at the roadside with its rear doors open.

An NHS ambulance clinician waited beside it. Dark hair in tight braids. Focused eyes. Farah Mahmood.

Nia stopped. Farah walked over.

"Injuries?"

"Hand lacerations and a possible shoulder separation," Nia said.

Farah opened the rear door and looked at Jamie and me.

"Can you walk?"

"Yes," I said.

We climbed out. Farah led us to the ambulance and sat us on the rear step. She cleaned and dressed Jamie's palms first.

He said nothing. He only stared at the road.

Then she examined my shoulder.

"This needs imaging."

"I know."

I would still resist A&E for as long as I could. Not because treatment cost anything, but because an A&E record and questions about the cause of the injuries could expose the covert work. Farah immobilised the shoulder anyway, wrapping it tightly enough to offer a little relief.

By the morning of 28 March 2026, the authorities had issued an official statement describing naturally occurring toxic gas and unsafe air quality within the cave system. Every entrance to Blackscar Caverns was closed. The heritage route, the adventure-caving tour, the old show-cave entrance, the open fell and the outlying cave entrances. Everything.

Graham Hargreaves, Head of Operations, was officially reported missing after the shutdown.

My contract mobile stopped working. I tried it twice. The screen remained dead, as though the device and its connection had never existed.

But my left ribs were still cracked. My right shoulder was wrecked. Jamie's palms healed into scars that would never fully fade.

It was real.

I hadn't ended whatever operated beneath Blackscar. I knew that. I had only disrupted it.

The cost was permanent damage. A compromised friend in Nia. And Jamie, who now knew what should never have been there.

On 30 March 2026, I sat in my vehicle in the empty Blackscar Caverns visitor centre car park and looked at the locked gates.

Somewhere below, in the darkness, it was still there.

Waiting.