The Lighthouse Below

I kept the contracts short on purpose. Three weeks, perhaps four. Nothing that required me to settle in or make friends or explain where I'd been before. I'd turn up, do the work, get my wages by bank transfer and leave before anyone grew curious.

That was the whole point. It wasn't about the money. I needed money, obviously, but I could have found steadier work if I'd wanted it. Better pension contributions. Holiday entitlement. A crew to join.

I didn't want any of that.

Short contracts meant I knew exactly when things ended. No surprises. No slow collapse when somebody decided I wasn't working out or the funding dried up. I chose the finish line before I started. It made everything easier.

That summer, I answered an advert for a fixed-term island-reserve maintenance contract with NatureScot.

The North Minch Islands Reserve. Fourteen islands and skerries scattered off the west coast of Scotland, most of them undeveloped. Lighthouses, basic campsites, reserve warden stations. Things that needed repairing in places where nobody lived all year.

The advert offered accommodation, a short rota and basic carpentry and electrical work. I emailed my CV on a Tuesday. They rang on Thursday.

I arrived in Stornoway for my induction on 29 June 2026. It was a harbour town used to selling Scottish tablet and sea-kayaking trips to visitors. NatureScot's reserve office stood back from the harbour in a rendered former warehouse, with a faded sign and a yard full of white fleet vans and battered Land Rover Defenders.

I walked in at 08:55 for a 09:00 induction.

Fiona MacLeod met me in the lobby.

She looked exactly as she'd sounded on the telephone. Direct. No wasted movement. Sandy-blonde hair pulled back tightly. Hazel eyes that watched me while she shook my hand.

She didn't smile much, but she wasn't cold either. Just efficient.

'Callum Reid?'

'That's me.'

'Good. You're on time.'

She handed me a clipboard.

'Fill this in. I'll be back in ten minutes.'

The paperwork was standard. Next-of-kin details, certifications, tool inventory, accommodation acknowledgement, pension and holiday entitlement. I left the next-of-kin line blank.

Nobody to call.

When Fiona returned, she barely glanced at the form. She turned to the final page, checked my signature and clipped it into a binder.

'You'll rotate through assignments as we need you,' she said. 'Some islands have more infrastructure than others. You'll get a list each week. Euan handles transport. He'll collect you from the harbour. Any questions?'

'No.'

'Good.'

That was it. She walked me to a back office, handed me the key to a sparsely furnished semi-detached staff cottage a short walk from the harbour, and told me to be at the landing stage for 06:30 the next morning.

I thanked her. She nodded and turned back to her desk.

I liked her immediately. She didn't care who I was or why I wanted a four-week contract on empty islands. She needed somebody who would turn up and finish the work. I could do that.

The cottage was bare but clean. Two rooms, a bathroom and a kitchenette scarcely wider than a cupboard. I dropped my holdall on the bed and didn't bother unpacking.

I never unpacked any more.

It was easier to leave that way.

The work began on 30 June 2026. During the first week, I replaced a section of rotten handrail on Eilean Daraich, patched a leaking roof on Eilean Mhanainn and changed three corroded light fittings in a warden bothy on Eilean Darach. Fiona gave me task sheets with photographs and Ordnance Survey grid references.

I ticked off each line, took my own photographs for the file and handed everything back at the end of the day. She would turn through the pages, nod and file them in one of the enormous binders stacked on her desk. I never saw those binders again. I assumed they went into storage somewhere.

It didn't matter. The work was real even if the paperwork disappeared.

Euan Fraser ran the boat. He was a big man with a weathered face and the kind of quiet that came from spending most of his life on the water. He didn't say much, and neither did I.

I'd meet him at the landing stage before dawn, climb into his eight-metre aluminium workboat and sit on the bench while he navigated between the islands. Sometimes he mentioned the weather. Most days he didn't.

I liked that too.

He would put me ashore, tell me when he'd return and leave. No small talk. No checking in. I'd work alone until I saw his boat coming back across the Minch.

The islands were quiet in a way I hadn't experienced for a long time. Not silent. There were birds, wind and Atlantic water striking the rocks, but the quiet was empty of people.

I'd go for hours without seeing anyone. Sometimes an entire day. Just me, the tools and whatever I was repairing.

I slept better than I had in years.

Fiona began giving me the jobs nobody else wanted. Not because they were difficult, but because they were remote or tedious or required somebody who wouldn't complain. I didn't mind. I preferred it. The fewer people there were, the easier it was to concentrate.

She never asked why I kept to myself. Never invited me to join the seasonal wardens for a drink, asked about the blank next-of-kin line or wondered why I hadn't unpacked. She simply handed me assignments and expected them to be completed.

I finished everything on time. I didn't object. I didn't ask for changes.

That made me ideal in her eyes, I think. Low maintenance. Reliable. Forgettable in the right way.

At the end of my original four weeks, Fiona offered me another seven days. A separate extension, with a new finishing date. I accepted because I could still see the line ahead of me. When that week was nearly over, she offered another.

One week at a time was manageable.

By then she had stopped double-checking my paperwork. She just filed it. Euan and I had settled into a rhythm. He'd bring the workboat alongside whichever pier or landing stage I was waiting at, I'd load my canvas tool holdall, and we'd head for the next island.

He treated me like cargo. Not badly. Just practically. I was another thing he transported, no different from timber or Calor gas cylinders.

I encouraged that. Stayed quiet. Didn't ask about his life. Slept in the single-occupancy accommodation they assigned me. Ate alone.

Kept everything controlled and manageable.

It was working.

By early August, I'd rotated through most of the reserve. I knew which landing stages were awkward in a crosswind, which bothies had the worst midges and which paths the wardens used most.

I didn't speak to the wardens much, but I saw them occasionally. They'd nod. I'd nod back. We'd carry on.

Nobody asked questions.

I gave them no reason to.

On Tuesday, 4 August 2026, the sky was clear and the Minch calm enough for me to see the workboat's ripples spreading behind us. Euan put me ashore on Caoraigh Island. From the landing stage, I could make out Eilean Daraich and a smaller unnamed skerry across the water.

Caoraigh Lighthouse stood at the island's northern end. It was an old brick tower with the keeper's house attached, painted white beneath a red roof. The sort of building that ended up on postcards. I'd been there once before to replace a section of rainwater guttering.

This time Fiona's task sheet said basement. A volunteer group had reported a draught and a crack in the concrete near the stairs. She wanted me to inspect the foundation and decide whether it needed sealing or whether the problem was more substantial.

Straightforward. Probably an hour's work. Two if the crack ran deep.

Euan handed me the canvas tool holdall and a handheld radio. Fiona's equipment checklist had also placed one charged spare radio battery in a resealable pouch inside my jacket.

'Back at 16:00,' he said.

'Got it.'

He pulled away before I reached the top of the landing stage. I watched the workboat cut across the water towards its next stop, then turned uphill.

The lighthouse looked the same as it had before. Clean. Maintained. Ready for visitors. A sign beside the entrance listed opening hours and its historical significance.

I didn't read it.

I unlocked the side door with the heavy brass master key Fiona had issued at the start of that week's rota and stepped inside. The air was cooler and smelt of old timber and dust.

I'd been inside enough lighthouses by then to recognise the smell. It wasn't unpleasant. Just old. Settled.

I found the basement door off the main corridor. It had been propped open with a wooden wedge, which seemed odd when the task sheet specifically mentioned a draught. If there was a draught, you shut the door.

I didn't think much of it. Volunteers did things like that. Forgot to close doors. Left wedges behind.

I pulled it wider and looked down. The staircase was wooden and steep, with no handrail on one side. There was a light switch at the top, but nothing happened when I pressed it.

Probably a failed bulb.

I took the headtorch from my jacket pocket, strapped it on and clicked it to its brightest setting. The beam cut into the darkness and struck concrete at the bottom.

I went down. The steps creaked but felt solid. No rot. I counted twelve before reaching the floor.

The basement extended ahead of me beneath a low ceiling, with support beams at regular intervals. Concrete floor. Stone foundation walls. Typical.

Except that it didn't feel typical.

I stopped at the foot of the stairs. My headtorch swept across the space. Nothing appeared wrong. No water damage, obvious cracks or debris.

The air was colder than it should have been. Not merely cool. Cold. Roughly six degrees colder than the corridor upstairs.

There was another smell beneath the dust. Faint. Damp, perhaps, with the sharpness of wet copper.

I breathed in and tried to identify it. Couldn't.

The draught was real. I could feel it against my neck, weak but steady, coming from somewhere deeper in the room.

I moved forwards, searching for the crack. The beam passed over foundation walls, support beams and the concrete floor. Everything looked sound. No water stains. No obvious breaks.

I assumed the crack was small. Perhaps hidden behind a beam or near the far wall, where the volunteers wouldn't have gone.

My boots were quiet on the concrete.

The cold worsened as I went deeper. That made no sense. Basement temperatures tend to remain fairly constant. This felt like walking into the chilled aisle of a supermarket.

The smell of wet copper grew stronger.

I reached the rear corner, where the spiral stair from the tower descended overhead. Iron treads curved into the darkness above, bolted into the stone.

I'd seen the building plans, survey drawings and maintenance photographs for this section. Fiona documented everything. There were three photographs of that exact corner: the stone foundation wall, the base of the spiral stair and the concrete floor.

That was all they showed.

Except there was a door.

It was narrow, about sixty centimetres wide, fitted where the stair met the wall in a recess I might have missed if I hadn't been tracing the draught. In the photographs, that spot was solid masonry.

Just stone.

I stopped and stared.

The door was old. Dark wooden planks held together by iron straps. A brass keyhole sat in the centre, the antique sort rarely seen now. It looked as though it might have belonged to the original nineteenth-century lighthouse.

I should have recorded it immediately. Taken out my mobile, photographed it and added a note to Fiona's task sheet: undocumented door in basement, solid masonry shown in survey photographs, further inspection required.

That was what I should have done.

I didn't.

I told myself it was probably access to an old utility space. A forgotten provisions cellar. NatureScot managed dozens of old buildings, and records were never perfect. Volunteers reported things inaccurately all the time. Perhaps the photographs showed the wrong section. Perhaps the door had always been there and simply hadn't made it into the file.

That was what I told myself.

I stepped closer. The draught was definitely coming through the gaps around the door. Cold air slipped between the timber and stone.

I touched the brass plate surrounding the keyhole.

It was warm.

Not hot, but warm, as though it had been lying in sunlight for an hour.

We were underground. There were no windows. No sunlight. The plate should have been as cold as everything else.

I snatched my hand back and examined my palm. No burn. No mark. Only the warmth fading from my skin.

I should have gone upstairs then. Called Fiona from outside, where the radio signal was clear. Told her about the door, the contradictory photographs and the warm metal, and let her decide what happened next.

That would have been the right decision.

But I'd already committed myself to the idea that it was only an old utility space. If that was all it was, I could open it, confirm what lay beyond, make a note and finish the job. There was no need to trouble Fiona with incomplete information.

That was what I told myself.

I tested the handle. It was an iron thumb latch. I pressed it down.

The mechanism yielded without a sound. No creak. No resistance. It moved as smoothly as if somebody had oiled it the day before.

The door swung inwards.

A steep flight of wooden steps descended into darkness beyond the reach of my headtorch. The walls on either side were stone rather than concrete. Older work. The steps looked hand-cut, their edges uneven.

I stood there looking down.

It made no sense. The lighthouse footprint wasn't large. I'd walked around the exterior before entering. The basement should have ended at the foundation wall.

There was no room for another space beneath it unless it extended beyond the building. That was possible, I supposed. Old structures sometimes had cold stores or provisions cellars outside the main foundations. It would have been practical before refrigeration.

That was probably what this was.

I leant forwards, trying to see the foot of the stairs. The beam found stone walls and wooden treads, but no floor. Only more darkness.

I should have closed the door, marked it on the sheet and completed the rest of the inspection.

Instead, I stepped down.

Only one step. Enough to confirm the space, perhaps see the bottom, then retreat and document it properly.

The air changed at once.

Wet. Cold. Not basement cold. A Hebridean winter cold, sharp enough to freeze spray.

My breath appeared in the headtorch beam.

I took a second step, telling myself it was only for a better angle. See the full depth. Then turn around.

The wet cold cut through my jacket. My fingers began to go numb.

I stopped.

This was stupid. I didn't need to see the bottom. I only needed to report the door and let Fiona handle it.

I took the radio from my belt and pressed the transmit button.

Static hissed loudly in my ear. Then nothing.

I tried again. Nothing. Not even static. The battery indicator was blank.

The radio had been fully charged when Euan gave it to me less than three hours earlier.

I clipped it back to my belt and turned towards the basement.

The light behind me had vanished.

Not dimmed. Not flickered. Vanished.

The doorway showed nothing but black. My headtorch beam struck the opening and seemed to stop, as if I were shining it against a wall made of darkness rather than into a room.

I stood on the second step, staring at the place where the basement should have been. Panic tightened in my chest, cold and controlled, while my mind tried to reject what I was seeing.

Then I scrambled upwards.

I wasn't thinking. I was only moving. My boots struck the uneven treads, and every impact echoed wrongly in the cold.

The short flight stretched beneath me. Steps appeared where there should not have been steps, or the space between them lengthened. I lost count almost at once. It was not the ordinary twelve-step basement staircase. It was something else, replacing itself as I climbed.

At last I reached for the place where the narrow door should have been, where it had stood open moments earlier.

My hand struck bare stone.

Solid. Flat. Cold enough to hurt.

I pressed both palms against it and ran them left, then right, searching for the frame.

There was only stone. Rough and porous beneath my gloves, nothing like the smoother foundation masonry in the lighthouse basement. It felt like rock from a cave or mine passage.

I kept one hand on the wall and forced myself to stop moving. My breath came fast and white in the headtorch beam. The air was so cold it seemed to draw the heat directly from my chest.

The staircase ended at a wall.

That was the fact.

I'd entered through an open door, taken two steps down, watched the basement disappear and then climbed through a space that had distorted beneath me. Now stone occupied the place where the exit had been, and it felt as though it had stood there for centuries.

I had no explanation for it. Not even a bad one.

My mind circled the same points. Door. Steps. Wall. Cold.

I made myself breathe slowly. In through my nose, out through my mouth, counting to four each way. It helped enough to steady my hands.

The way back was gone. Sealed, replaced or shifted somewhere I couldn't reach. Standing there would not bring it back.

I turned carefully, keeping one hand against the wall, and swept the headtorch downwards.

The narrow wooden staircase descended behind me. Its exact length no longer made sense. Below it lay more darkness.

I tucked my hands under my arms for a moment, trying to restore feeling to my fingers. Then I looked for anything that wasn't stair or stone.

The walls curved inwards several metres below, beyond the final wooden treads. It wasn't a sharp corner but a smooth, gradual slope leading back into the rock.

I descended cautiously. After another uneven stretch, the wooden steps ended. Beyond them, the ground levelled into a tunnel.

It was narrow, perhaps a metre and a quarter across, with a rounded ceiling that appeared carved rather than poured. The stone was darker there, almost black in places, and damp enough to catch the sheen of my headtorch.

I crouched and touched the floor. Fine gravel or coarse sand lay packed over solid rock. My glove came away wet.

The tunnel sloped down and away, bending left about six metres ahead, where the light could no longer reach.

I remained crouched for a while, staring into it.

It wasn't on the building plans or survey drawings. It wasn't in Fiona's binders. There was no reason for a tunnel beneath Caoraigh Lighthouse. No mine on the island. No cave system I'd heard of.

Even if there had been, it would not have joined a lighthouse basement through a warm keyhole in a door that the photographs proved did not exist.

But the tunnel was there, and the stairs behind me ended at solid stone.

There weren't many options.

I stood, adjusted the headtorch and began walking.

The tunnel remained narrow. I kept my left hand against the wall, partly for balance and partly because I didn't want to lose all sense of the direction I'd come from. The stone beneath my palm was slick in some places and dry in others. Uneven. Natural rock rather than laid blocks.

My boots crunched on the gritty floor. Each step echoed faintly, but the sound died quickly, as though the air were too heavy to carry it.

The cold pressed in from every side. I could feel it passing through my jacket and settling into my shoulders and back. Every breath formed a thick white plume in front of me.

The tunnel curved left, then straightened. Its descent was shallow but constant. I was going down. Not steeply enough to need my hands, but enough to feel the strain in my calves.

I glanced back once. The beam showed perhaps four metres of tunnel before the darkness swallowed it. The staircase was already out of sight.

I carried on.

After a minute or two - I wasn't judging time well - the walls began to change. They grew smoother, less like rough rock and more like a surface worn or polished over years.

The air shifted too. It remained cold, but now it moved. A faint current brushed my face from somewhere ahead.

Then the headtorch struck the wall about three metres in front of me, and for an instant I could see through the stone.

Not clearly. Only a flicker. A suggestion of open space or distant light on the other side.

It vanished so quickly that I thought I'd imagined it.

I stopped and stared at the spot. The rock looked solid again. Dark, wet and unbroken.

I took another step. The beam moved with me, and I saw it once more.

The air rippled where the light touched the wall. Either the rock bent or the light did. I couldn't tell which. It resembled heat shimmering above a road in summer, except that the air was bitterly cold.

I reached out slowly and touched the place where the ripple had appeared.

Solid stone. No different from the rest.

When I drew my glove away, however, the air between my hand and the wall looked distorted. The beam bent through it at an angle that did not belong to the space.

I didn't like it. I didn't know what to do with it either.

I kept walking.

The ripples became more frequent as the tunnel curved again. I caught them at the edges of the headtorch beam, small warps that made the rock seem thin or translucent. Several times I thought I saw shapes beyond it. Dark masses. Trees, perhaps, or boulders.

Nothing remained clear long enough to name.

The floor began to level. The slope eased, disappeared, and the walls widened by perhaps thirty centimetres on either side. It was not much, but the space felt less like a throat and more like a passage.

Then the ceiling lifted.

I looked up. The headtorch no longer reached stone. Its beam continued into open black air, tall enough that I couldn't see the top.

Ahead, perhaps nine metres away, there was light.

Not bright. Not warm. A dull greyish glow, like an overcast dawn.

It spilled into the tunnel through an opening I couldn't yet define.

I walked towards it. My boots sounded louder now. Their echoes climbed into the open space above me and did not return.

The tunnel opened, and I stepped onto a shore overlooking what looked like the Minch.

That was my first thought.

The shape felt right. Dark water stretched away, flat and still. A rocky strand lay beneath my boots. There was the same sense of something vast and cold occupying the horizon.

But it was wrong.

The water was too dark. Not the blue-black of deep Atlantic water. Simply black. Flat and smooth, without wave or ripple, extending soundlessly to a horizon I could barely see.

The sky was worse.

It was a dull purple. Not the purple of sunset or a storm. Something in between, washed out and muted. It covered everything from the waterline to directly overhead. No clouds. No variation. Only that same flat colour pressing down.

There was light, but no sun.

I tilted my head upwards and saw a pale spot almost directly above me. It was bright enough to make me squint, but not painful to look at. It sat in the purple sky and gave off light that cast no shadows.

I looked down. There was no dark shape beneath my boots. The scattered stones were illuminated evenly from every direction, without definition or contrast.

The air smelt of salt water. Clean. Cold. Empty.

I turned.

The lighthouse stood behind me.

It had the same broad proportions as Caoraigh Lighthouse, the same height and general shape, but little else.

There were no windows. The tower rose as a smooth, unbroken column of something that looked poured and hardened rather than built. It was a dull grey-white, like unpainted concrete. The lantern room had no glass. A rounded cap sealed the top as though the whole structure had melted shut.

I stared at it for a long time.

It was not Caoraigh Lighthouse.

The real tower had painted brick, windows at intervals and a red-roofed keeper's house attached. This looked like a copy made by somebody who had heard a lighthouse described once and misunderstood half of it.

I turned back towards the water and looked in both directions. The shore stretched away beneath low, barren ridges. No rowan, birch, heather or wind-bent Scots pine. No undergrowth. Nothing.

Only grey sand and bare rock sloping towards the black water.

The coastline curved into the distance and disappeared in purple haze.

I took the radio from my belt and pressed the transmit button. There was a dead click, half a second of static, then nothing. The first battery had drained completely.

I left the charged spare sealed inside my jacket. I wasn't going to expose it until I understood what was happening.

I clipped the radio back and checked my mobile.

No service. I'd expected that.

The battery showed 61 per cent, which was wrong. It had been at 87 per cent when I left the workboat.

I watched the number change.

61. 60. 59.

One percentage point every three seconds.

I switched the mobile off and pushed it deep into my pocket.

The shore was silent. No wind. No birds. No water touching the rocks. Only my breathing and the faint crunch of sand when I shifted my weight.

I lowered the canvas tool holdall from my shoulder. Habit, perhaps. When everything else fails, check the equipment.

I crouched on the rocks and unzipped it.

Everything inside looked as it had when Euan handed it to me that morning. A slotted screwdriver. A two-pole voltage tester with a cracked yellow casing that I'd meant to replace for a year. Three spare fuses in their cardboard sleeve. An extra headtorch battery in a resealable plastic bag. Six metres of thin nylon rope, tightly coiled. A crushed oat bar with golden syrup. And the heavy brass master key Fiona had issued at the start of the week's rota, intended for lighthouses, storage sheds, warden bothies and anything else I might need to unlock.

I picked up the key.

It felt heavier than it should have. Not by much, but enough for me to notice, which was strange because I'd carried it all week without thinking about its weight.

I turned it over. The tarnished brass and worn teeth looked unchanged, but the metal felt denser, as though it had absorbed something.

I returned it to the holdall and closed the zip.

The equipment explained nothing.

I stood and looked back at the false lighthouse. A smooth, sealed column. No windows. No visible door. No way inside.

It was the only structure in sight, so I walked towards it. That is what you do when there is only one option.

I had gone perhaps nine metres when the sound came.

A foghorn.

Its long, low note rolled across the sand from somewhere inland, behind me and to the left, beyond the ridge.

I stopped and turned my head.

Caoraigh Lighthouse had no foghorn. The established shipping routes through the Minch were marked by larger stations and other navigation aids. There was no reason for a fog signal to sound from the interior of this barren copy of the island.

The blast faded.

I waited.

It came again at the same pitch and for the same duration, exactly fifteen seconds after the first.

Too regular. Too clean.

The false lighthouse was not going anywhere, and standing still achieved nothing. I turned towards the ridge and followed the sound.

The shore rose into a low bank of grey sand. My boots sank slightly with every step. There was no grass or driftwood, and the sand looked as though it had never been wet despite the black water lying close behind me.

At the top, the land dipped into a shallow valley roughly six metres across, smooth and empty.

The foghorn sounded again. Closer now.

I went on. The valley curved left and widened. I saw the metal frame before I understood what it was.

It had been bolted into nothing.

The frame stood alone in the sand, nearly two metres high, made from square steel tubing. It resembled the hoists fitted to piers for lifting equipment or small boats from the water.

There was no pier. No concrete base. Four thick bolts ran straight down into loose sand, with nothing solid to hold them.

I approached and stopped.

A faded red-and-white lifebuoy hung from one of the crossbars by a frayed length of rope. It was the sort of MCA/SOLAS-compliant lifebuoy found on every workboat and landing stage, but this one looked ancient and chalky. The red had faded almost to pink.

I touched it.

The surface was dry, powdery and soft enough to crumble. When I pulled my hand away, fine pink dust coated my fingers. I rubbed them together, but the dust only smeared.

The steel frame itself was clean. No corrosion. The bolts looked new.

'You've only just arrived.'

I spun round.

A man stood about four metres behind me, just beyond the bend in the valley where I hadn't been looking.

He must have emerged while I was examining the lifebuoy.

He was perhaps a metre and seventy-eight, thin in the way of somebody who had missed too many meals. His dark hair needed cutting. His skin was pale and his eyes exhausted. He wore stained, stiff work trousers and a faded HM Coastguard sweatshirt with cracked lettering across the chest.

His hands were buried in his pockets. He stood very still, as though deciding whether to remain or run.

I said nothing. My hand went to the radio on my belt, which was pointless because its battery was dead.

'Your light is still on,' he said.

He nodded towards my head.

The headtorch was still strapped in place and shining. I'd forgotten about it.

I switched it off.

'Thanks.'

He didn't move. We watched each other for several seconds.

'I'm Gareth,' he said at last. 'Gareth Price.'

'Callum.'

'You came through a door.'

It wasn't a question.

I nodded anyway. 'Yes. In the basement of Caoraigh Lighthouse. There was a draught. I went down to inspect the foundation and found another staircase.'

Gareth's mouth moved, not quite forming a smile.

'That's how it works.'

'How what works?'

'Getting here.'

He pulled one hand from his pocket and gestured vaguely at the sand, ridge and purple sky.

'You go looking for something wrong, and it opens. Doesn't matter which island. Doesn't matter what you're repairing. You go down or you go in, and then you're here.'

I glanced past him towards the ridge and the black water hidden beyond it.

'Where is here?'

'I don't know.'

He said it without emotion.

'I've been trying to work that out for fourteen days.'

I stared at him.

'Fourteen days?'

'I disappeared on 21 July 2026. I was checking navigation lights on Sgeir an Diabhail. Went into the storage bunker at the north end and found a hatch in the floor that I'd never seen before. I opened it, climbed down and came out on a shore that looked like Sgeir an Diabhail, except it wasn't.'

He removed his other hand from his pocket. His fingers were red and badly chapped.

'I thought I'd walk until I found a warden. Or my boat. Neither happened.'

'Your boat was gone?'

'Gone. Your radio is dead, isn't it?'

I nodded.

'They don't work here. I tried mine for three days before I stopped wasting my time.'

Gareth tilted his head and studied me.

'Have you got GPS? A mobile?'

'Mobile. No signal. Battery started draining.'

'It wouldn't help anyway.'

He shifted his weight and glanced over his shoulder towards the ridge before looking back at me.

'You can't stay out here.'

'Out where?'

'Open ground. Away from shelter.'

His voice became quieter and more deliberate.

'It isn't safe when the light changes.'

'What light?'

He pointed upwards.

I followed his hand. The pale spot in the sky looked exactly as it had when I arrived. Dull. Washed out. Casting no shadows.

'It dims,' Gareth said. 'Not completely, but enough. When it does, you don't want to be outside.'

'Why not?'

He looked at me for a long moment.

Then he turned and started towards the far end of the valley.

'Follow me.'

I didn't move immediately. I looked back at the metal frame, the crumbling lifebuoy and the bolts driven into loose sand.

Gareth stopped and glanced over his shoulder.

'Are you coming?'

I followed.

We walked for about two minutes, passing out of the valley and climbing another low rise. Gareth moved quickly. He didn't look back or speak. I kept several paces behind and watched where he put his feet.

The sand was the same everywhere. Dry, grey and loose. No plants. No insects. No sound except our boots.

At the crest, Gareth stopped and pointed down.

I came alongside him.

A pit had been dug into the sand below, roughly two metres across and a metre deep. Salvaged pallet boards lay across the top as a crude roof, leaving gaps between them. Torn builders' polythene had been stretched over the boards and weighted with stones.

It was a shelter. The least somebody could build with nothing else available.

Gareth climbed down and crouched beneath the boards. I remained at the edge.

'This is where you've been living?'

'Yes.'

I looked around. No other structures. No trees. No windbreak.

'For fourteen days?'

'Yes.'

He reached into one corner and produced an empty plastic water bottle, then another. Four empties stood in a row against the sand wall.

Beside them were strips of something pale and leathery, laid out carefully as though he were rationing them. They resembled seaweed, though there was no sign that anything lived in the black water.

Gareth picked up one strip and held it towards me.

'Hungry?'

I examined it. Grey-white, shrivelled and probably scraped from damp rock somewhere.

'No.'

'You should eat.'

'I'm all right.'

He shrugged and returned it to the row. Then he sat with his back against the sand wall and drew his knees up.

I unzipped the canvas tool holdall and took out the crushed oat bar with golden syrup that I'd packed before Euan collected me that morning. It was flattened but still sealed.

I tore it open and ate half in two bites. Gareth watched me chew.

'Have you got any more of those?'

'One.'

'Save it.'

I finished the crushed oat bar and stuffed the wrapper back into the canvas tool holdall. My mouth felt dry. I had no water.

Gareth was still watching me.

'You need to stay close to shelter,' he said again. 'When the light dims, you don't want to be out there.'

'You said that already.'

'I'm saying it again.'

I looked at the pit, the salvaged pallet boards and the torn builders' polythene. Fourteen days of this. Fourteen days of leathery growths scraped from damp rock, empty bottles and hiding beneath planks when the light changed.

'What happens when the light dims?' I asked.

Gareth did not answer at once. He looked past me towards the ridge, then towards the water.

'I don't know,' he said quietly. 'But I'm not going out there to find out.'

The purple light began to dim. Not quickly. It drained away as though someone were turning a dial down one degree at a time. I noticed when the sand stopped looking grey and became charcoal.

The sky did not change colour. It remained the same washed-out purple, only darker and flatter. The foghorn continued at the same interval, one low blast every fifteen seconds.

I pulled back my sleeve and checked my watch. A digital one might have been more useful, but I had always worn the same hand-wound Smiths my grandfather gave me when I turned eighteen.

The face showed quarter past two. I tapped the glass with my knuckle. The second hand was not moving. I pulled out the crown and wound it.

The tension felt normal. I pushed the crown back in and watched the second hand. It twitched, jumped forwards two seconds, stopped, jumped again, paused for four seconds, then began to move. The rhythm was wrong. Too slow, then too fast, as though it could not decide how long a second ought to be.

I let my sleeve fall over it. Gareth was still sitting in the pit with his knees drawn up. He had watched me throughout.

'Doesn't work properly here,' he said.

'I'd gathered that.'

'The horn's better.'

He tilted his head towards the sound.

'Marks the changes.'

'What changes?'

'Light. Tide. I don't know.'

He rubbed his face slowly with both hands, as though trying to wake himself.

'Sometimes a way back appears near the lighthouse.'

That got my attention. I straightened.

'What sort of way?'

'I don't know what to call it. A door, perhaps. Or a gap. It isn't always there.' He lowered his hands and stared at the sand between his boots. 'It only appears during certain horn cycles, and only for a little while.'

'How long is a little while?'

'A couple of minutes. Perhaps less.'

His voice dropped.

'I missed it before.'

'How?'

'I was too far from the tower when it opened. By the time I reached it, it had gone.'

I considered that. The tower stood roughly two hundred metres from the shelter. If an opening appeared and remained for two minutes, reaching it would be tight but possible.

Unless you did not know it was coming.

'How do you know when it will appear?'

Gareth shook his head.

'I don't. I've seen it twice. Once four days ago and once yesterday. The horn pattern was different each time. I can't find a system.'

I looked back towards the ridge where the tower stood. The pale light had dimmed enough that I could no longer see its top, only the base, still that dull greyish white.

I made a decision. Probably not a clever one, but sitting in a pit and eating things scraped off rocks did not seem clever either.

'I'm going to the tower,' I said. 'I'll wait there.'

Gareth's head snapped up.

'What?'

'If the way back appears near the lighthouse, I want to be close when it does. Better odds.'

'No.'

He stood so quickly that he nearly struck his head on the pallet boards.

'You can't stay near the tower.'

'Why not?'

'Because it isn't safe.'

'Neither is this.'

I zipped the holdall and slung it over my shoulder.

'You said the way back appears there. That's where I'm going.'

Gareth climbed out of the pit, stumbling in the sand.

'You don't understand. Staying near the tower draws something.'

I stopped.

'Draws what?'

'I don't know. I've never seen it.'

Panic had entered his voice.

'But it travels beneath the sand. I've seen the surface move and swell, as if something underneath is pushing through.'

I looked at him. His face was pale and exhausted. He was not lying.

'When does it move?'

'When someone's too close to the tower for too long. Or when...'

He stopped and swallowed.

'I don't know. I only know you don't stay there.'

I thought about it for perhaps three seconds. Then I walked towards the ridge.

'Wait,' Gareth said behind me. 'Just wait.'

I did not. I kept going, my boots crunching over the dry sand. My headtorch remained off because the dim purple light was still just bright enough to see by.

I heard him following about six metres behind. I did not turn.

The sand grew looser as I climbed the ridge. My boots sank more deeply with each step, and I had to lean forwards to maintain any momentum. At the crest, I looked down. The water remained flat and black. It made no sound.

The lighthouse stood about thirty metres to my left.

I walked towards it. Gareth kept pace behind me without speaking. When I glanced back, he was rubbing his throat with two fingers as though it hurt. He did it twice in ten seconds.

I reached the base of the tower and stopped.

Up close, the surface did not resemble concrete. It looked like compressed salt, grey-white and grainy, tiny crystals catching the failing light.

I touched it. The surface was cold and rough. Fine white dust covered the fingertips of my glove when I drew my hand away.

I began to circle the tower, keeping one hand against it for reference. My boots left clear prints in the sand. It was smaller than the real Caoraigh Lighthouse, though its proportions were broadly similar, perhaps four metres across. There were no windows, no door and no seams. Nothing but the unbroken salt-like surface.

Then, three-quarters of the way round, I found a keyhole.

It was set directly into the wall at waist height, surrounded by a brass plate. Its antique shape matched the lock on the service door I had opened beneath the real lighthouse. The door that had begun all this.

I stopped and stared.

Gareth came up beside me, breathing hard.

'Don't,' he said.

I ignored him. I crouched and examined the keyhole straight on. The brass was tarnished, with green corrosion in the crevices. The opening was dark. I could see nothing inside.

I unzipped the holdall and took out the heavy brass master key Fiona had issued at the start of that week's rota.

'No,' Gareth said, louder now. 'Don't do that.'

I fitted the key into the lock.

It slid in smoothly. A perfect fit.

'Please,' Gareth said.

I turned it. There was more resistance than there should have been, as if the mechanism inside were ancient, stiff and clogged with rust. I kept turning until my wrist began to ache.

Then something yielded with a low, solid click. I felt it through the metal.

A thin vertical crack appeared above the keyhole. It ran upwards for about a metre, crossed over and descended again, describing the outline of a door. There was no handle.

The seam opened on darkness. Absolute darkness. My headtorch was off, but the purple light should still have revealed something beyond it. It revealed nothing.

A cold, wet draught seeped through. It carried a sharp smell of wet copper, the same smell I had noticed on the stairs below the real lighthouse, only stronger.

Gareth seized my shoulder. His fingers dug through my jacket.

'That isn't an exit,' he said.

His voice cracked.

'That isn't the way back. The openings I've seen weren't like this. The key has signalled something inside. You've told it we're here.'

I opened my mouth to ask what he meant.

The sand behind us moved.

It was not the wind and it was not a collapse. The surface lifted into a smooth curve about three metres away. The swelling was perhaps sixty centimetres across. It held for a second, then subsided and began moving towards us.

I watched without moving. For one second, I could not.

Gareth's hand remained on my shoulder, trembling.

The swelling came closer. The seam in the tower widened by a few centimetres.

A hand pushed through.

It had five long fingers coated in grey grit, like wet sand compressed into skin. The knuckles bent in the right direction, but the proportions were wrong. The fingers were too long, the palm too narrow, the wrist too thick where it vanished into the darkness.

A second hand followed, identical in its wrongness. Both pressed against the edges of the opening, testing its width and feeling how much space they had.

I stopped thinking. My body moved without permission.

I turned, gripped Gareth's arm and dragged him towards the ridge. He stumbled, recovered and began to run. I followed.

The swelling in the sand was closer now, perhaps two metres from the tower. It sank, then rose again to our left, tracking us.

Gareth reached the ridge and scrambled upwards. I followed. The loose sand swallowed my boots, and I used my hands to haul myself forwards.

At the top I looked back. The hands remained in the seam, pushing it wider. The thing beneath the sand had stopped at the foot of the ridge directly below us.

Waiting, perhaps.

Gareth grabbed my jacket.

'Move.'

I moved.

We had taken perhaps nine metres down the other side when his grip changed. He was no longer pulling me. He shoved me hard.

I pitched forwards and barely stayed upright. When I turned, Gareth stood close behind me with his hands raised. His face was no longer frightened. It was settled.

'Go back,' he said.

His voice was rough and hoarse, as though he had been screaming.

'Go back to the door. Go through it. I'll stay here.'

I understood then. He believed that if I entered the false doorway, whatever we had summoned would follow me or take me. He would be free to wait for the next genuine opening.

He was trading me for his chance to leave.

'No,' I said.

'You only just arrived.' His hands shook, but his eyes did not move. 'I've been here fourteen days. I'm not staying.'

'Neither am I.'

'Then we both go back to the tower. We both go inside and see what happens.'

I did not answer.

Gareth stepped towards me.

I still had the intact key in the false lock. Leaving it there had been stupid. I ran back two paces, reached over the crest and wrenched it free. The seam remained open.

Gareth lunged as I turned. I caught the key by its stem and jabbed the heavy bow into his mouth. Not hard enough to break his teeth, only hard enough to stop him. He gagged and staggered back, then bent coughing with his hands on his knees.

I did not wait. I ran up the ridge again, the intact key clenched in my fist. My boots sank and my lungs burned. The cold air scraped the inside of my throat.

At the crest I looked down. The swelling was moving again, faster now. It surged up the slope, the sand splitting, rejoining and splitting once more, as though whatever travelled beneath it was choosing a direction.

I half ran and half slid down the other side onto the flat shore. The tower was thirty metres ahead. Its opening had widened. Both hands protruded as far as the wrists.

They were no longer pulling at the seam. They merely rested there with their fingers spread, waiting.

I ran straight towards them.

Three metres from the tower, I stopped and thrust the key back into the lock. I tried to turn it anticlockwise, hoping to reverse what I had done. It would not move.

I gripped it with both hands and twisted with all my strength. The metal bit through my gloves. The mechanism was jammed, or locked, or simply did not work that way.

The hands twitched.

I released the key and stepped back. The canvas tool holdall still hung from my shoulder. I unzipped it, pulled out the six-metre coil of yellow nylon rope and shook it loose. One end was frayed where I had cut it from a longer length the previous month.

I looped the rope twice through the key's bow and pulled it tight. Then I threaded the other end through the holdall's handles.

The canvas bag was heavy with tools. Its weight would give me leverage.

I stepped back until the rope drew taut, braced my feet and hauled with both hands.

The key did not turn.

I pulled harder. Pain spread through my shoulder. The rope bit into the canvas handles, and I heard stitching tear.

The key remained fixed.

I shifted my grip, drove my rear foot deeper into the sand and threw my full weight backwards.

The key snapped at the shoulder inside the lock with the sound of a small bone breaking.

The outline in the wall shuddered. The hands jerked back and vanished into the dark.

The seam slammed shut so quickly that I barely saw it move. It caught the rope and cut it cleanly. The severed end attached to my holdall dropped into the sand at my feet. The other portion remained trapped on the far side with the key's bow and short stem.

The toothed blade was still buried in the supernatural lock.

I stood holding the bag and breathing hard, staring at the smooth wall where the opening had been.

The foghorn sounded. Long and low.

Fifteen seconds passed.

Then the world lurched.

It was not an earthquake. The sand beneath my boots remained solid, but everything else tilted. The purple light flickered. The pressure changed, and my ears popped.

I turned.

A door stood beside the tower.

It had no wall around it. It was simply a wooden door with iron hinges and a frame, planted upright in the sand as though someone had built it and forgotten the rest of the building.

It was the real service door.

Beyond it, a flight of uneven steps rose into darkness before straightening into the familiar basement stairs. At the top I could see real light. Yellow electric light.

I did not think. I ran.

The sand dragged at my boots, but I did not slow. I passed through the doorway, climbed the distorted flight and then took the ordinary twelve basement steps two at a time, using the walls for balance.

The air grew warmer. The smell changed to dust, old timber and paint.

I reached the top. The real corridor was there inside Caoraigh Lighthouse, with the side entrance six metres to my left.

I turned and slammed the service door behind me.

The draught vanished.

I stood with one hand against the door and listened.

Nothing. No foghorn. No cold. No sound except my breathing and the creak of the floorboards beneath my boots.

I looked down. The severed length of rope still trailed from the holdall. Caught in its last loop was the broken bow of the brass key with a short section of stem below it. I pulled the fragment free and put it in my jacket pocket.

The toothed blade had remained inside the false tower.

I took the radio from my belt. Its first battery was dead. Fiona's equipment checklist had placed a charged spare in a resealable pouch inside my jacket before departure. I found it where it should have been, tore the pouch open, removed the drained battery and fitted the spare.

The radio beeped. Its light showed green and fully charged.

I pressed the transmit button.

'Fiona.'

Static answered, then her voice came through, clipped and clear.

'Go ahead.'

'It's Callum. I need collecting.'

A pause.

'You're not scheduled until 16:00.'

I checked my watch. The second hand was moving again, smoothly and at a regular pace. The time was 15:15.

'I know,' I said. 'I fell. I'm finished for the day.'

Another pause.

'Are you injured?'

'No. Just finished.'

'Understood. I'll call Euan. Stand by.'

I clipped the radio back onto my belt, walked to the side entrance and stepped outside.

The air held the humid warmth of an August afternoon, along with salt, heather and a trace of peat smoke carried across the Minch. I went down to Caoraigh's landing stage and sat on the edge with the holdall beside me.

The sea was blue. Actually blue. Small waves moved against the rocks with a steady, audible rhythm. From the landing stage I could make out Eilean Daraich and a smaller skerry whose name I did not know.

I opened the holdall. The cleanly severed section of rope was still inside. The other portion had remained in that place.

I reached into my jacket pocket and took out the key fragment. Only the tarnished bow and short stem had come back with me. The break at the shoulder was bright and jagged. The toothed blade was gone.

I put the fragment back and zipped the pocket shut.

Twenty minutes later, Euan's eight-metre aluminium workboat rounded the point. He came alongside, cut the engine and threw me a line. I secured it and climbed aboard.

'Early,' he said.

'Yes.'

He studied me for a moment. I looked back. He did not ask.

We left at 15:40 and reached Stornoway harbour at 16:30.

Euan tied up at the pier. I stepped ashore with the holdall and walked directly to the sparsely furnished staff cottage.

Inside, I dropped the bag on the floor, sat on the bed and pulled off my boots. My hands were shaking slightly. I made them stop.

Then I emptied the holdall. Slotted screwdriver, two-pole voltage tester, fuses, the drained radio battery, headtorch and the severed length of rope.

I picked up the rope and examined the cut. It was smooth, without any fraying. I placed it at the bottom of the bag.

Then I took the key bow and short stem from my jacket pocket. I stared at them for a long time before placing the fragment in the holdall's side pocket.

Separate from the rope. Like contaminated components. Like things that still mattered but should not touch.

The next morning, 5 August 2026, Fiona gave me a new task sheet. Eilean Darach. Roof patch. Solo job.

I accepted it without comment.

The following day it was Eilean Daraich, repairing a rotten handrail. After that came electrical work on Eilean Mhanainn.

I worked. I finished every task on time. I took photographs and filed the paperwork.

My original four-week fixed-term contract had already been extended in weekly increments. Fiona offered another week after Caoraigh. I accepted because seven days still gave me a known finish line. When that week ended, she offered one more. I accepted that too.

Fiona stopped asking whether I was all right after the first week. Euan never asked at all.

I did not return to Caoraigh Island.

When Fiona assigned Caoraigh Lighthouse to me again on Thursday, 20 August 2026, I told her I could not do it. I said there was an equipment issue. She reassigned the job and did not press me.

I kept working. I kept the same routine. Harbour at 06:30, workboat, island, work, workboat, staff cottage.

I stopped wearing the Smiths watch. It continued to run, but after a few days its rhythm went wrong again. Sometimes it raced. Sometimes it skipped. I would look down and see 14:17, then look again ten seconds later and find it showing 14:19.

I placed it in a drawer and left it there.

On the night of 25 August 2026, exactly three weeks after Caoraigh, I was sitting in the staff cottage with the windows open and the lights off.

A foghorn sounded.

Long and low.

I sat upright.

There was no operational fog signal inland from Stornoway. The harbour signals lay in the opposite direction. The night was clear and calm. There was no reason for that sound.

But I had heard it.

It came from inland, away from the sea.

I walked to the window and looked out. Nothing moved. There was only the quiet road, a white fleet van parked two cottages away and a porch light burning across the terrace.

Fifteen seconds passed.

The foghorn sounded again. The same length. The same tone.

I closed the window and went to bed.

It happened four more times over the following fortnight. Always at night. Always from inland. Always at intervals of exactly fifteen seconds.

I told no one.

I kept the key fragment and the severed rope in the canvas holdall, separated. Once a week I checked that they were still there.

They were.

I kept working.

That was it.