The Stones of Eilean Dearg

The algae came back every week. That was the thing nobody mentioned when I started at Dunstaffnage Marina, near Oban. You scraped the berths on Monday and by Friday they were green again. Not a little green. Aggressively, personally green.

The kind of green that made tourists stop and point as if they'd discovered something. I'd been doing it for about two years by then. Two years of scraping pontoons, pumping fuel, coiling lines and helping blokes in expensive outdoor waistcoats reverse their trailers down the slipway. It was a good job.

I mean that genuinely. Nobody expected anything from me except that I turned up and did the physical work, and I had always been good at physical work. I'd spent most of my twenties getting good at it in places that weren't Argyll. The tourists liked to talk.

That was fine. They'd ask about charter boats and fishing reports and whether the water was too cold for kayaking, and I'd answer in as few words as I could manage. They'd walk away thinking I was just a quiet harbour hand who liked the sea.

Which was mostly accurate.

The part they missed was the flare pistol in my tool bag.

I kept it between a folding knife and a waterproof torch, beneath a coil of spare mooring line. Not standard marina equipment. Obviously. I just never felt right without something within reach.

A flare pistol was legal, loud and, if you aimed it correctly, something else entirely. I'd had it since I left the Royal Marines six years earlier. I carried it every day without really thinking about it any more.

That's me.

The other thing I kept hidden was the dagger.

Not an actual dagger. A tattoo of one, small and black, inked beneath my left cuff about three inches above the wrist.

I wore a hoodie over it all year. Even in July, when it became warm enough for tourists to turn up in swimming costumes, I kept a long-sleeved flannel shirt beneath the hoodie with the cuffs down. The coast near Oban stayed cool enough that nobody looked twice.

I needed nobody looking twice.

The whole point of the marina job was that nobody noticed anything about me. I was just the bloke scraping algae. The part of me that had taken part in compound-clearance operations in Helmand Province was somewhere far beneath the water.

Quiet.

Done.

The routine was good for that. Monday algae. Tuesday fuel inventory. Wednesday hauling the pontoon trolleys up the ramp because the tide gauge was behaving strangely again. It worked most of the time.

I didn't think about what it meant that I needed it to work.

My lunch break was usually around noon. I'd walk half a mile along a narrow single-track road off the A85 towards a small crofting township north of Oban and stop at Mairi MacLeod's place. She called it a bait shop, but it was really her house with a cooler of bait and a hand-painted sign outside. She'd have coffee ready.

I don't know how she always knew I was coming. She just always had coffee ready.

Mairi was sixty-two, perhaps older. She wore her silver-streaked hair in a long plait that she kept tossing over her shoulder when she spoke. Dark eyes, with deep lines at the corners. The kind of face that had been outside in every season for decades and had made peace with it.

She moved slowly and deliberately, as if she had all the time in the world and knew something you didn't. She sold bait and she talked.

That was the whole arrangement. I'd bring her something, usually a petrol-station pastry because I'm not imaginative. She'd hand me coffee and talk for about forty minutes, then I'd walk back.

Her stories were always about the water. Not the water as in tide tables or mackerel runs. The water as if something lived beneath it and had opinions.

She talked about the Each-Uisge.

She explained the name once, and I'd probably been saying it badly ever since. An old water-horse from the Gaelic stories. Large, antlered and bad-tempered in a very particular way. She described parts of the coast that fishermen went around without explaining why. Not because of rocks or currents, but because of something else.

Offerings left beside the water. Boundaries marked in stone. What happened to people who disturbed either.

"The caves have been hungry lately," she said once, about a week before everything started.

We were sitting in the folding chairs she kept beside the bait cooler. She said it the way she might have mentioned a road closure or an approaching front.

"Which caves?" I asked.

"The ones beneath the Morvern cliffs."

She held her mug in both hands.

"Something's restless."

I said something like, "Huh," and ate my Danish.

That's not me being dismissive. I liked Mairi's stories. There was something in them that felt genuinely old, and she told them straight, without performing for anyone. But I also assumed every stretch of deep, cold water had versions of those stories. Creatures below the surface. Things that feared fire. Old warnings shaped around an event so distant that the event itself had vanished and only its outline remained.

I told myself that every time I walked back to the marina.

I was wrong about it, but I didn't discover that until later.

Stuart Kincaid appeared on a Tuesday.

I was at the fuel berth at about 16:00. Overcast. The sea flat and grey. I was running the hose out to a thirty-two-foot motor cruiser belonging to a bloke called Graham Pritchard, who was always about two minutes from telling me a long story I didn't need. So I was working quickly.

Footsteps sounded on the pontoon behind me.

I turned.

Six foot two. Barrel-chested. Dark hair greying at the temples. The particular sort of face that had spent twenty years under hard sun and wasn't apologising for it.

Polo shirt, chinos, light jacket hanging wrongly on the left side where a shoulder holster sat beneath it. I registered all of that in perhaps two seconds, then knew exactly who he was.

Stuart Kincaid. My former troop sergeant.

I hadn't seen him since I got out.

"Daniel," he said.

As if he'd been expecting me, rather than the other way round.

I returned the fuel nozzle to the pump.

"Kincaid."

He smiled. A practised smile. The kind that meant he'd already decided what was going to happen and was merely being polite about the preamble.

He came and stood beside me with his hands in his jacket pockets, looking across the water like a man enjoying the view.

"Nice out here," he said. "Quiet."

"Yeah."

"You look well."

I said nothing to that.

He allowed a moment to pass. I kept my eyes on the motor cruiser and watched Graham Pritchard disappear into the cabin. Kincaid glanced down at my arm, at the cuff of my hoodie where the flannel shirt showed beneath it, then looked back towards the sea.

He'd seen the edge of the black dagger. I was fairly certain that was how he'd found me in the first place.

He started talking about a woman called Imogen Vale. Twenty-six years old. She presented a popular wild-swimming and sea-kayaking channel from Glasgow. Nature, coastlines, that sort of content. She had a substantial following, he said.

I understood that to mean her disappearance would be noticed.

She'd gone out near a group of sea caves beneath the Morvern cliffs, on the protected coastline of the Sound of Mull, about five days earlier. She hadn't come back.

Her father, Richard Vale, was a senior aerospace executive based in Farnborough. Kincaid didn't specify exactly what senior meant. Richard Vale wanted his daughter found without a news cycle.

No official search teams dragging the coast on camera. No press vans. Just a quiet recovery.

"Quiet meaning what, exactly?" I asked.

"Meaning handled."

He said he was working through Northbridge Risk now, a London-based corporate risk consultancy. That was where he'd landed after leaving the service, apparently. He had part of a team assembled, but he needed someone with particular skills. Someone comfortable moving in low light.

Someone who knew water.

I looked at him. He looked back with those pale blue eyes that always seemed to be running numbers.

"No," I said.

He nodded slowly, as if that were expected, and reached into his jacket pocket.

I thought it was his mobile.

I was already half turned, hands loose at my sides, reading the geometry of the pontoon in case I needed it.

It wasn't a mobile.

It was a pen injector. The thick marker sort, spring-loaded.

He was faster than I'd given him credit for. He caught me in the side of the neck before I'd moved more than a few inches.

I felt it immediately. Not pain. Warmth.

Then my legs stopped cooperating.

I grabbed the fuel-pump housing. It slowed me down for perhaps two seconds.

"Easy," Kincaid said.

He caught my arm, matter-of-fact about it. As if this were a normal Tuesday for him, which it probably was.

I went down on one knee, then both.

The pontoon boards smelt of diesel and wet timber. I was still awake, but my hands had stopped listening to me.

Kincaid crouched beside me.

"Not rushed," he said. "You're going to wake up in Edinburgh. There'll be a briefing file. You already have the job, Daniel. This was just scheduling."

The sea was flat and grey. Graham Pritchard was still in his cabin.

Then there was nothing.

The upmarket central Edinburgh hotel had heavy curtains with blackout lining.

I know that because the first thing I noticed when I came round was how dark the room was, even though it wasn't actually dark outside. The second thing I noticed was my wrists.

Black cable ties. Thick ones, the sort sold by a builders' merchant. They secured me to the arms of a chair upholstered in something that felt like velvet.

Fancy chair. Fancy restraint situation.

That was a fair preview of how everything was going to go.

My neck was stiff where the injector had caught me. My mouth tasted like old pennies and whatever they'd used to keep me under for the additional hours.

The room was cold. Not uncomfortably cold. Just hotel air conditioning running because nobody had thought to adjust it. A floor lamp in the corner provided most of the light.

The curtains were almost closed, except for a gap perhaps four inches wide. Daylight came through it in a narrow stripe across the carpet.

Kincaid stood beside the window with his arms folded. He'd changed out of his marina clothes into a pressed shirt, which felt like a calculated choice. He watched the stripe of light as if it owed him something.

Someone else sat on the sofa near the television. An older man, about sixty. Shirt open at the collar, dark trousers, rimless glasses that probably cost more than my van.

He held a mobile in both hands and watched something on the screen with the volume low. His face barely moved.

I looked at my wrists again. The ties weren't going anywhere without a blade or a hard edge.

"Morning," Kincaid said without turning.

I didn't answer.

"You were out for about eleven hours. We drove north last night and came back this morning."

He finally turned.

"You're in Edinburgh."

I looked at the man on the sofa.

"Richard Vale," Kincaid said. "Imogen Vale's father. He's the client."

Vale looked up from the mobile. Light blue eyes behind his glasses. He gave me a very slight nod, the way people did in conference rooms when acknowledging someone three levels below them.

"Mr Mercer."

I looked back at my wrists.

Kincaid crossed the room and drew a folding knife from his pocket. He cut the left tie first, then the right. He folded the knife, put it away and stepped back to give me room.

I rubbed my wrists and stood carefully. My legs were fine. Whatever he'd used had cleared.

Vale held up the mobile. On its screen was a vertical video, the kind recorded with a phone propped against a kayak deck bag or on a rock ledge. A woman in a buoyancy aid and quick-drying shorts paddled through a narrow rock passage.

Auburn hair. She spoke to the camera in a quick, practised rhythm, pointing out features in the cave walls as she went. Her voice was clear and slightly breathless. She looked like someone who was good at this and knew it.

Then the feed cut.

Vale lowered the mobile. He said nothing, merely placed it face-up on his knee as if he were still thinking about it.

"Imogen Vale," Kincaid said. "Twenty-six. Wild-swimming and sea-kayaking presenter. She entered the Morvern sea caves nine days ago. Her last transmitted location puts her somewhere within the cave system. Nobody recovered her. No ransom contact initially."

He paused.

"Contact came three days ago."

"What kind of contact?"

"Verbal. Through an intermediary. Someone wants money. They want it quiet."

He pulled a chair away from the small desk and sat on it backwards.

"Richard doesn't want this in the news. No official search teams combing the shoreline on camera. No press vans."

I looked at Vale. He was still staring at the mobile.

"We want her back," he said.

His voice was even. Boardroom even.

"Quickly, without complications."

"Complications meaning reporters."

He didn't deny it.

I looked at Kincaid.

"You could have called me."

"You would have said no."

"I'm saying no now."

He rested his forearms across the back of the chair.

"Seven hundred and fifty thousand pounds. Flat fee. Retrieve her, keep it quiet, walk away."

I considered that for perhaps two seconds.

"No."

Vale shifted on the sofa.

Kincaid didn't blink. He reached into his shirt pocket, removed a folded sheet of paper and placed it on the desk. He slid it towards me without standing.

I didn't move.

"Helmand," he said. "2012. The vehicle checkpoint."

That was all he said.

He knew it was all he needed to say.

I stood there and looked at the sheet of paper. I didn't pick it up. I didn't need to read it to know what it probably contained.

The investigation had gone quiet because enough people wanted it quiet. But quiet wasn't the same as gone. Shelved charges could be taken off the shelf. That only required paperwork and someone making a phone call.

The air conditioning hummed.

The stripe of light across the carpet hadn't moved.

"All right," I said.

Kincaid nodded once.

"All right."

That was the entire negotiation. Forty-five seconds, perhaps. Three days of my life gone.

He already had most of the team assembled, which meant he'd been planning this whether I agreed or not. I had probably always been the final piece.

That bothered me a little, but I filed it and moved on.

He laid out the operation over coffee in the hotel room. Proper coffee, too. Room service. Silver pot on a tray.

Vale had moved to the window by then. He stood looking down at the street with his hands in his pockets. I don't think he was interested in the logistics.

"Hannah Price, thirty-two. Scottish Ambulance Service paramedic."

Kincaid brought up a photograph on his tablet. I recognised her immediately. She'd been attached to us as a medic during two deployments. She was the reason at least three men in our troop still had all their fingers.

She was also one of the most aggressively direct people I'd ever served with, which made me feel slightly better about the situation.

Slightly.

"She agreed to this?" I asked.

"She agreed when she heard you were leading it."

I didn't know what to do with that, so I moved on.

"Ross Calder, thirty-eight. Commercial diver from Greenock. He's bringing his own cylinders, a drysuit and a compact side-scan sonar unit."

Kincaid said Ross had done salvage work in the western sea lochs for six years and knew the rock formations around the Sound of Mull.

His photograph showed a large man with reddish-blond hair, a broad, flat face and a faded anchor tattoo on his right forearm. He looked solid. Like someone who arrived and did what needed doing without talking about it first.

"Euan Fraser, twenty-four. Postgraduate geology researcher at the University of Glasgow. His fieldwork covers coastal formations around the Sound of Mull. He's been inside parts of the Morvern cave system twice."

The photograph showed a thin lad in a University of Glasgow hoodie, wire-framed glasses pushed up his nose. He was squinting slightly at whoever held the camera.

"Why a postgraduate?" I asked.

"The NatureScot coastal geologist we wanted refused. Fraser came recommended. He knows the terrain."

I studied the photograph again.

He was twenty-four and looked twenty-four. He looked like someone hoping nobody asked him anything difficult.

"Does he know what he's getting into?"

"He knows it's a recovery operation. He knows there's a kidnapping involved."

"Does he know it might get loud?"

Kincaid lifted his coffee.

"He'll work it out."

Great.

That was great.

We drove west that same day. Kincaid had hired a grey Land Rover Discovery, which was a reasonable choice for not being noticed.

Hannah was waiting in the hotel lobby when we came down. She wore her ambulance service jacket over a dark T-shirt, with a medical kit strapped to her thigh.

She looked at my face, then Kincaid's, then back at mine with an expression she'd had years to practise.

"Hello," I said.

"Don't," she said.

We got into the Discovery.

Ross Calder met us at motorway services on the road out of Edinburgh. His pickup was already loaded with diving equipment, the cylinders secured in the load bed with ratchet straps. He shook my hand with the kind of grip that came from years of hauling equipment rather than trying to prove anything.

"Heard it's cold-water work," he said.

"It is."

"Good."

He hated warm-water diving. Then he got back into his pickup.

I liked him immediately.

Euan Fraser was waiting in an independent cafe near Glasgow, sitting at a corner table with a laptop open and a day pack the size of a small fridge propped against his chair.

He stood when we entered, knocked his coffee with his elbow and caught it before it spilt.

"Mr Mercer?"

"Daniel's fine."

He nodded and immediately began telling me about the ages of the basalt and sandstone formations around the Sound of Mull. I let him continue for about forty-five seconds, then told him we could cover the terrain briefing in the Discovery.

He nodded quickly.

"Right. Yes. Sorry."

We travelled north on the A82, then west along the A85 towards Oban. Euan talked geology from the back seat most of the way. Hannah stared through the window at the treeline. Kincaid drove and said very little.

I watched the road and thought about how it had been a perfectly ordinary Tuesday morning before a pen injector appeared.

We staged the vehicles in a gravel car park behind a storage building near the ferry terminal on the south side of Oban. Kincaid had a contact who'd cleared it.

We would launch farther up the coast and cross towards the Morvern cliffs, but we needed somewhere to hold equipment and coordinate before moving. The car park worked. It smelt of salt, old rope and diesel. A rusted chain-link fence ran along the back.

Nobody else was there.

It was mid-afternoon. We had perhaps four hours until dusk, when Kincaid wanted to move.

Ross began checking his cylinders. Euan spread a laminated coastal chart across the bonnet of the Discovery and marked entry points with a dry-wipe pen. Hannah sat on a wooden cable drum and ate half a cereal bar without offering any to anyone, which was how she processed situations she hadn't entirely approved.

Kincaid didn't ask where I was going when I walked away from the car park.

He probably knew.

Mairi's place was a short drive north, then a walk along the single-track road. The handwritten sign on the door said she closed at 17:00, but it was unlocked at 16:43. A small bell above the frame sounded when I entered.

The place smelt of bait tanks, coffee and cedar. Mairi kept a wooden bowl of cedar shavings beside the till.

She was behind the counter, writing in a ledger with a ballpoint pen. The old-fashioned sort of record-keeping she'd always used.

She looked up. She looked at my face.

She put down the pen.

"Sit," she said.

I sat on the stool beside the counter. She went into the back and returned with two mugs of coffee. Black for me. Something from a small bottle on the shelf added to hers.

She sat on her stool and studied me for a moment without speaking.

"You're going into the caves," she said.

"Yeah."

She turned her mug once between her hands.

"I heard about the girl with the camera."

I said I wasn't surprised. News moved quickly around Oban and the nearby townships, especially bad news. People along the coast noticed things.

She looked through the front window towards the road. A pickup passed slowly.

"The caves were wrong for a few weeks before she disappeared," she said.

She paused.

"Things wash ashore wrong. Birds behave wrongly. The water's been pushing out when it ought to draw in."

I drank my coffee and said nothing.

"If you find something in there," she said, "something that looks as if it was left deliberately, placed or arranged..."

She looked straight at me.

"Leave it alone."

"What kind of thing?"

"You'll know. It won't be natural to the place, but it'll look right. It'll look as if it belongs there, as if someone put it there for a reason."

She said the word "offering" carefully, as though setting it down between us.

"Leave it alone. Don't touch it. Don't move it."

"Don't take it."

"Exactly."

"All right."

She watched me to see whether I meant it. I must have looked convincing because she lifted her coffee again and didn't press further.

"I'm not going to tell you not to go," she said. "You're going anyway."

"Yeah."

She nodded.

"Just come back."

I finished my coffee, left the mug beside her ledger and returned through the early evening to the car park. Kincaid stood at the Discovery's open tailgate, checking a gear bag.

He looked up when I came round the corner of the storage building.

"Ready?"

I thought about Mairi's face when she'd put down her pen before I'd said a word. The way she'd said offering. The way she'd looked out of the window at nothing.

"Yeah," I said. "Let's go."

The equipment fitted across five sea kayaks. Kincaid had hired them from a place in Tobermory that didn't ask questions, which suggested he'd used it before.

We loaded them in a secluded coastal car park while the last daylight turned pink above the trees. Hannah checked her medical kit twice. Ross ran a hand over his cylinder valves and said nothing. His diving cylinder was secured across the deck of his own kayak.

Euan stood beside the water holding his pack straps and looking as though he were doing sums in his head that weren't producing the right answer.

"Radios off," Kincaid said. "No exceptions."

"What happens if we need extraction?" I asked.

"We won't."

That was that.

The sea was cold and flat and smelt of deep stone. The water around the caves always did. Something old and mineral beneath the salt.

We paddled out in a loose line. Kincaid led, with me second, Hannah third, Ross fourth with the cylinder across his deck, and Euan at the rear. His paddle strokes were uneven, which probably meant he was looking around instead of holding his line.

The Morvern sea caves weren't far from our launch point. We crossed open water, then the cliffs rose around us, the channels narrowed and the sound changed.

Everything echoed in there. Your own breathing sounded louder than it should.

We reached the first arch at dusk. I could still see well enough, but the light had flattened and reddened, turning the cave walls the colour of old brick.

Kincaid switched on a waterproof torch without ceremony.

That was when I smelt it, before I saw anything.

Wet copper. Strong.

The kind of smell that meant you were already beyond the point where you should have turned back.

The body was wedged between two rock shelves about eight feet inside the cave mouth. A man in a full wetsuit, face down, his arms trapped behind him where the rocks narrowed.

I moved close enough to see the back of his neck and what remained of his throat.

It wasn't a fall. Falls tore things differently. There was nothing organised about them.

Whatever had opened this man's throat had done it in strips, parallel, clean at the beginning and ragged at the end. As if something had been trying to peel rather than cut. As if it had needed to get through quickly and hadn't particularly cared about neatness.

I backed my kayak away by a foot and looked at Kincaid.

He held the torch on the body for perhaps four seconds, then directed the beam farther into the cave.

"Keep going," he said.

Hannah came alongside me and looked. Her jaw tightened once. She said nothing, then followed Kincaid.

I stayed for another second.

The wetsuit was a common older model, the sort available from almost any diving supplier between Greenock and Oban. No visible identification. No diving knife on the belt, which was wrong.

Divers almost always carried one. Either someone had taken it or he hadn't had time to reach it.

I filed that away and paddled after the others.

The caves went deep if you followed the correct channels. We travelled about forty metres before the roof dropped and we had to duck.

A ledge ran along the north wall of the main chamber, broad dark stone, dry enough to beach a kayak and stand. Kincaid pulled onto it first and swept his torch around.

The camera case sat on the ledge as if someone had placed it there deliberately.

Black hard case. Small. The sort a presenter might use for a mirrorless camera or action camera. I'd seen enough of Imogen Vale's equipment in Kincaid's briefing photographs to recognise the sticker on the lid.

A weathered white mountain hare, peeling slightly at one corner.

It was hers.

I pulled up beside Kincaid and climbed out. Euan was already there. He picked up the case before anyone spoke. I let him because his hands were steady and his glasses suggested he'd read the labels before touching anything.

He released the catches, removed a small waterproof action camera and held down the power button. The battery still had a charge.

Barely.

The final clip was forty-two seconds long.

I watched over Euan's shoulder.

Imogen Vale appeared on the screen, her face tight, speaking quickly. She was somewhere dark, with a small lamp behind her, sitting on what looked like a camp bed or low bench. Two figures stood at the edges of the frame, deliberately outside it. Their shoulders were visible. One wore some kind of fleece or canvas waistcoat.

She was arguing. The audio kept dropping out, but I caught fragments.

"I told you..."

"You said..."

"Just let me..."

Then came a hard splash beyond the camera.

Not a small sound. Something heavy entering water from a height.

Then a voice.

I didn't recognise the language. Not Spanish, French or any of the fragments I'd picked up overseas. It wasn't panicked, exactly. It sounded like pleading, but flat and almost rhythmic, as if whoever spoke were repeating something memorised long ago.

Then the clip ended.

Euan lowered the camera.

Nobody spoke for a second.

"Play it again," Kincaid said.

Euan replayed it. Kincaid watched with his arms folded, his torch pointed towards the ceiling.

When the clip ended for the second time, something changed in his face. I couldn't quite name it. Not relief, but close.

The opposite of concern.

As though a number had come back exactly as expected and he could stop wondering.

I tucked that away.

"She was alive when that was recorded," Hannah said.

"The timestamp is thirty-six hours ago," Euan said.

He was already checking the file information through the camera's menu.

Kincaid nodded.

"Good. Let's move."

We backed the five kayaks out of the chamber. Tight work. Three-point turns in black water with our torches held low. Ross had to muscle his hull around twice because of the cylinder.

The body remained where it had been when we passed on the way out. I didn't look for long.

About halfway back to open water, something struck the bottom of my kayak.

Not a rock. Not a piece of submerged timber.

The impact came directly from below, and it was deliberate. One hard thrust straight upwards, enough to flex the hull and click my teeth together. I felt it through the seat.

Ross heard it and turned his head. I shook mine once. He faced forwards again.

The smell had returned. The same wet copper as near the body, only stronger now, and it was moving with us.

I kept my paddle in the water and my strokes even.

I thought about Mairi's voice. An old thing. Something that feared fire.

The flare pistol was in my tool bag beneath the bow hatch. I was acutely aware of exactly how many movements it would take to reach it.

Nothing else struck us.

We emerged into open water. The smell faded. I breathed through my nose until the air smelt only of salt again.

Nobody mentioned it.

We crossed the Sound of Mull to Eilean Dearg in darkness. About forty minutes of paddling.

Ross ran the compact side-scan sonar unit mounted to his kayak. I watched his face instead of the water. He checked the display twice in quick succession, then stared straight ahead and didn't look at it again.

I didn't ask.

We landed on the island's southern shore and hauled all five kayaks above the waterline. A narrow path led up from the beach through the trees, then continued north towards the disused lighthouse and keeper's cottage.

We had been on Eilean Dearg for perhaps ten minutes, packs on our backs and Euan consulting a topographical map on his mobile, when I saw the stones.

They were about fifteen feet off the main path in a small clearing. A ring of pale quartz stones, four feet across, built with care. Not thrown together or kicked into place. The sort of care that took time and meant something to whoever had arranged it.

The island was dark basalt. Pale quartz didn't belong there. Somebody had carried the stones onto Eilean Dearg and placed them deliberately.

In the centre of the ring, resting flat on the uppermost stone, lay a small silver rowan-leaf pendant. It was clean and dry, which made no sense considering how damp everything else was.

I'd seen it around Imogen Vale's neck in the briefing photographs. It was visible in the thumbnail of her final uploaded video, the one Kincaid had printed and passed around the Edinburgh hotel room.

Hannah came up beside me and reached towards it.

I caught her wrist.

She looked at me.

I looked at the stones, then back at her. She slowly withdrew her hand.

"I wasn't going to take it," she said.

"All right."

I hadn't been certain. I'd stopped her before finishing the thought.

I studied the quartz again and the pendant positioned exactly at the centre of the ring. Mairi had said I would recognise it. That it would look as if it belonged. That it would look placed.

She'd been right.

The whole arrangement was deliberate in a way that made my shoulders tighten.

Leave it alone.

I stepped back from the ring.

Two seconds later, five men emerged from the trees.

They were spread wide, which meant they'd planned it. They had been in position before we arrived.

One carried a shotgun. Two held hunting rifles, bolt-action by their profiles. The remaining two had pistols lowered beside their thighs.

They were dressed for the island in layered dark clothing and boots. They moved as if they knew every path, root and low branch in that particular clearing.

Their leader stepped forwards once and stopped.

Baseball cap. Fleece waistcoat. Narrow face. A permanent squint from years of sun reflecting off water. Tanned in the way guides became tanned, not the colour of a tourist after a warm weekend.

A thin white scar crossed the knuckles of his left hand. I hadn't noticed it before because I'd only seen him from the far side of a fuel berth.

Callum Reid.

He ran sea-kayaking and wildlife tours from Oban. His website had a lot of photographs of smiling clients. Five-star reviews.

He'd nodded at me once across the marina. I'd nodded back. That had been the extent of our relationship until then.

Now he looked at me as though we were catching up.

"Hello, Daniel," he said.

Easy. Conversational.

"You're usually finished with the pontoons by 16:00."

That bothered me a little.

"Took my time today," I said.

He nodded as if that were entirely reasonable.

Then he looked at all five of us in turn, unhurried, and explained his terms. Richard Vale had money. Callum had Imogen Vale.

He wanted a sum transferred quietly. No HM Coastguard involvement. No press. The whole thing could be concluded by morning.

He described it like a straightforward transaction, as if we'd all eventually accept that it was the sensible option.

While he spoke, I watched his eyes.

They kept moving left.

Towards Kincaid, specifically.

Not towards me. Not towards Ross's cylinder or the gear bags. Towards Kincaid, as if he were waiting for something.

A nod. A signal.

An agreed cue.

Kincaid held his hands slightly raised. Not all the way, just the opening gesture of someone preparing to negotiate. He nodded a little.

Reasonable. Patient. Letting Callum believe the conversation still had somewhere to go.

Then Kincaid shot him.

One round low. Callum went down hard.

Kincaid had removed the agreed witness and produced the noise his plan required.

Then everyone moved at once.

The first three seconds were only noise.

Someone shouted. Someone fired back. I dropped low and moved right because that was what my body did when things became loud.

Ross was already down on one knee. I thought he'd stumbled. Then I saw the wet darkness spreading through the lower leg of his cargo trousers and understood that he hadn't stumbled at all.

"Calf," he said.

Not a scream. Just a status report.

Hannah was already moving towards him. That was the thing about Hannah. She didn't decide to help someone. She was simply there before the decision needed making.

I had the flare pistol in my hand. It was the only thing I'd removed from the tool bag before we launched, which probably said something about how I expected the night to go.

A single-shot marine distress flare. The kind that burnt orange and didn't care what it touched.

A man moved through the trees to my left, trying to gain a better angle. I swung and fired without giving it much thought.

The flare struck his shoulder.

That part I'll leave there.

It did what it does.

Callum went down loudly, and then he wasn't making any noise at all.

The other three still standing looked at one another, then towards the tree line, and made a quick collective decision. They ran. The whole thing took perhaps four seconds.

Euan stood about eight feet from me with a pistol I hadn't known he had, pointing it at a body near the trees. His glasses sat crooked across his face. He was breathing much too fast.

"Did I..." he began.

"Yes," I said. "You did."

He lowered the pistol slowly. He didn't say anything else. Neither did I. There wasn't much to say.

Kincaid was already searching Callum's pockets. Quick and professional, as if this had always been part of the plan. Maybe it had. Hannah had Ross's trouser leg rolled up and was pressing a field dressing against the wound in his calf with both hands.

The bleeding was heavy, but not the sort that ends things.

"Through and through," she said. "He can walk."

"Wonderful," Ross said, and he actually sounded as though he meant it.

I stood for a moment in the quiet that follows gunfire. Five armed men had arrived knowing my name and my working hours. Their leader had kept glancing at Kincaid, waiting for an agreed cue. Kincaid had shot him the moment the failed negotiation gave him a clean opening, removing a witness and making the noise he needed.

I thought the criminal part of the night was more or less finished.

Then I looked at the water.

The flare had burnt out above the Sound, its orange arc falling into the darkness. Something out there had answered it.

I noticed the shape before I understood what I was seeing. A head. Large.

Black in the way deep water is black. It rose slowly and kept rising. Things branched from the top of it, irregular and warped, like antlers left submerged for a very long time.

Its eyes caught the last flare-light and returned it green.

I'm not going to say I wasn't frightened. I was. But there is a kind of fear that clears everything else out and leaves room for thought, and that was the kind I got.

It stopped at the waterline. Exactly there. It remained in the shallows and watched us.

I looked at the ring of stones.

Pale quartz. Euan had said it was wrong for the island's dark basalt. Someone had brought the stones to Eilean Dearg, built them carefully into a circle and placed Imogen's silver rowan-leaf pendant inside it, clean and dry. Now something vast and old waited at the edge of the sea without crossing the shore.

Not because it couldn't. Because it wouldn't. As though it recognised a boundary.

Mairi MacLeod had once told me, over her dreadful coffee in the little shop near the crofting township, that there were things in the sea lochs which remembered when the water was younger.

She had told me to leave offerings alone. If I ever found a ring of stones that didn't belong, I wasn't to touch what lay inside it.

I hadn't laughed. I'd nodded and changed the subject. I should have asked more questions.

"We move now."

Kincaid stood beside me, looking at the water. He didn't look like a man confronted with the impossible. He looked like a man checking a variable.

"Take the pendant. Break the ring. We draw it towards the net gun and secure it from there."

"Secure it?" Hannah had looked up from Ross's leg. "What does that mean?"

"Contain it. Transport it. There are buyers."

"You brought a net gun," she said. "To the Sound of Mull."

"Modified pneumatic system. It's been tested."

"Stuart."

She stood. Ross's blood still covered her hands.

"That thing is the size of a boat."

"Smaller specimens have been secured before."

"Specimens?"

She repeated the word as though identifying something rotten.

"And Imogen? She's still somewhere on this island."

"Imogen was always a secondary concern."

That landed differently from everything else he had said that night.

I looked at him. He met my eyes without flinching.

"The ring," he said. "Now, before it goes back under. Take the pendant."

I crouched beside it. The rowan leaf gleamed within the quartz. I left it where it was.

Instead, I deliberately lifted five stones from the circle and put them into my pack. Each was cold, pale and heavy. Removing them opened a clear gap in the ring.

"What are you doing?" Kincaid said.

"If that's a boundary, we may need to restore it somewhere else."

"I told you to take the pendant."

"No."

The broken ends of the ring lay exposed before me. I didn't know whether I had made things better or worse, but I knew I wasn't giving Kincaid the offering.

"Euan," I said.

He was crouched at the edge of the clearing, no longer looking at the water. He had his mobile out, its torch aimed low across the ground where the grass met the trees.

"There are prints," he said. "Fresh ones. Smaller than any of the men who were here."

He looked up, his glasses still crooked.

"Significantly smaller."

I went over. He was right. The footprints were narrow and pressed deeply at the toes, as if someone had been moving quickly. They led north along the tree line towards the far end of the island.

Kincaid started to object. I was already moving.

"Daniel."

That was Hannah.

"Stay with Ross," I said. "Euan, with me."

"The ring," Kincaid called, louder.

I didn't answer.

I knew the island's layout roughly from charts and tourist maps I had studied three days earlier. The disused lighthouse stood at the northern end beside its keeper's cottage, both supposedly unoccupied. The footprints were heading north.

That was enough.

Euan caught me within ten paces. We moved through the trees without torches, navigating by the sound of the water and what little sky showed through the canopy. He stayed close and didn't speak, which I appreciated.

The lighthouse was a white column above the trees, taller than I had expected. The keeper's cottage beside it had boarded windows. A notice on the protected-coastline signage said the door was secured by padlock.

The padlock hung open.

The door swung inwards when I pushed it. We searched the cottage first. Empty rooms, mildew and old timber. Imogen's footprints crossed the dust and ended near a cut opening in the floor beneath the tower stairs.

It wasn't an original hatch. Someone had sawn a square through the concrete. The edges were clean, and an aluminium ladder had been bolted beneath them, descending into darkness.

A low mechanical sound came from below.

"Generator," Euan whispered.

I looked at him, then into the opening.

I went down first.

The shaft opened into a low concrete tunnel cut through the rock beneath the keeper's cottage. It smelt of damp stone, petrol and exhaust. At the seaward end, the passage sloped towards a flooded opening which must have connected to the caves below the island.

A portable generator of the sort sold by any builders' merchant stood beside a fuel can. It powered two work lights hanging from a single orange extension lead along the ceiling. Their glare was harsh and uneven.

Imogen Vale sat in a camping chair in the middle of the tunnel. Cable ties fixed her wrists to the armrests and her ankles to the legs. A silver foil blanket covered her shoulders and had done very little to warm her. Her hair was tangled. A cut above her left eyebrow had dried brown around the edges.

She was shaking, but her eyes were open and tracking us.

"Hello," I said.

She blinked.

"Are you..."

Her voice was ruined from hours of silence and thirst.

"Are you here to get me out?"

"Yes," I said.

She released a long, ragged breath, the sort a person has been holding for far too long.

Euan climbed down behind me and made a small sound when he saw her, somewhere between relief and distress. I was already moving towards the chair.

A man stepped from the darkness at the far end of the tunnel.

I didn't see him until I was halfway to Imogen. He raised a rifle. Not a firearm, but a tranquilliser projector with a telescopic sight and a compressed-gas mechanism. He was broad, square-faced and dressed in stolen commercial marine-engineering coveralls. He didn't look particularly concerned by any of us.

"Stop there," he said.

I stopped.

"Euan, go back up," I said.

He hesitated, then climbed. The man watched him go but didn't fire. He seemed to be waiting for the rest of us.

The ladder rattled again. Hannah descended first, carrying her medical kit. Ross followed carefully, favouring his wounded calf but still moving under his own power. Kincaid came last and took his time.

When his boots reached the tunnel floor, he looked around as though entering a hotel room he had reserved in advance.

"Everyone relax," he said.

Hannah had already reached Imogen's left side. She began cutting the cable tie at her wrist and didn't stop when Kincaid spoke. That was very Hannah.

"Kincaid," I said.

I kept my voice flat.

"What is this?"

He told me directly, which I hadn't expected. People in his position usually drag the truth out. He simply said it.

Imogen Vale had never been the point.

She was bait. A popular wild-swimming and sea-kayaking presenter with a public profile, a frightened father and a known last location near the Morvern sea caves. She had been placed on Eilean Dearg, not hidden there. Placed near something that came from the water and respected a boundary of pale quartz.

The plan had been to use the firefight's noise, movement, lights and flare to drive it towards the lighthouse. The flooded tunnel beneath the keeper's cottage connected to the sea caves below the island. A capture rig waited in a crate against the far wall, a pressurised net system adapted from equipment used to tranquillise and tag large animals.

Callum's group had been part of it. Callum had watched Kincaid for the agreed cue. Kincaid had shot him to remove a witness and produce the burst of violence required by the capture plan.

"Richard Vale is money," Kincaid said. "Nothing more."

Northbridge Risk had another buyer. He wouldn't name them. Imogen's rescue and her father's money were secondary to delivering the creature alive.

I stood there for a moment.

"You drugged me and drove me to Edinburgh for a rescue job," I said.

Kincaid almost smiled.

"You wouldn't have come otherwise."

"No."

Hannah freed Imogen's second wrist and moved to her ankles.

The man with the tranquilliser rifle was Martin Shaw. I learnt his name later. He kept the barrel aimed at the centre of our group rather than at any one person. He had flat grey eyes and the look of someone who had spent years doing dull work for unpleasant people and regarded this as another shift.

I looked at Kincaid. He was moving towards the crate.

That was when I decided I had finished waiting.

I crossed the distance quickly. He heard me and turned, but not quickly enough. I reached the capture rig before he did, and we hit the wall together.

The crate toppled. He drove an elbow into my jaw hard enough to loosen something near my back teeth. I felt it. I kept moving.

Martin fired.

The compressed-gas mechanism gave a sharp pop. The dart missed me and struck the rock beside the flooded shaft. It ricocheted back into Martin high on the shoulder. He staggered against the wall, struck his head on the concrete and went down behind the fallen crate.

For half a second, I thought that was the only shot.

Then the projector fired again as it hit the floor.

Ross made a sound. Not a shout. More a surprised grunt, the noise you make when something has happened to your body before your mind understands it.

A dart stood from his left shoulder, its flights yellow. He was already listing sideways. He reached for the tunnel wall.

His hand slid down the concrete. He stumbled backwards, three steps, then four.

There was no floor behind him.

He fell into the flooded shaft.

I hadn't properly registered it before then. It was a square opening in the floor at the end of the tunnel, ringed with old concrete, perhaps four feet across. Black water sat level inside it, connected somewhere below to the caves and the open sea.

Ross went in feet first and disappeared. The surface closed above him and scarcely moved.

Nobody spoke for about a second.

Then the water moved a great deal.

Something rose that was not Ross.

It came quickly. It was huge. The word that would not settle properly in my mind was wrong. Simply wrong.

Black, wet and massive. Its head was longer than a man's torso, with branching growths spreading from the crown. Not antlers exactly, but something grown in darkness without a plan. Its eyes caught the work lights and reflected green, the colour of old copper.

When its neck rose, it filled most of the tunnel.

Kincaid went for the capture rig.

He actually went for it. I want to be clear about that.

He dropped to the floor, seized the mechanism and began trying to arm the net. It told me everything I needed to know about how long he had imagined this moment and how little he understood its speed.

The Each-Uisge turned its head towards him.

It was not slow.

I caught Imogen by the arm. Hannah had freed her ankles.

I didn't look at what happened to Kincaid. I heard it. A noise like a wet branch tearing apart, then something louder, then nothing from him at all.

"Ladder," I said.

Imogen stood without help. She was unsteady, but she moved. Hannah guided her towards the ladder while I tore off my pack.

The five quartz stones lay at the bottom beneath my water bottle and first-aid kit. I pulled them free.

They were irregular, cold and heavy. I dropped them into the shaft one after another, all five, quickly. Then I kicked the overturned capture crate in after them.

I didn't know why I thought it would work.

Mairi's voice was in my head, telling me to leave an offering alone. I had taken that to mean I shouldn't touch it. Perhaps she had meant something else. Perhaps the important thing was to return a disturbed boundary to the water it belonged to.

The stones struck the surface.

A grinding began almost at once. Low and slow, like two millstones turning, or something settling back into a place it recognised.

The creature lowered its head. Not suddenly. Gradually, the way a tide withdraws.

I didn't watch the rest.

I was already at the ladder.

Euan waited above. He caught Imogen's arm as she cleared the final rung and pulled her onto the cottage floor. She sat heavily on the stone and covered her face with both hands.

She wasn't crying. She was simply finished.

Hannah climbed after her. I came last.

Ross's pack stood beside the opening where he had left it before descending. Hannah knelt beside it. She didn't open it. She rested one hand on the top and remained there for a moment.

That was all she did.

Below us, the grinding ceased. The shaft became quiet.

The generator continued running. Machines don't care what happens around them. The work lights remained on and the extension lead still ran along the tunnel ceiling. Everything unchanged, one person fewer.

I sat beside the ladder opening and looked at the cottage ceiling.

Euan said something. I didn't catch it. Imogen answered more quietly. Hannah stood and picked up her medical kit.

Nobody spoke about Ross. Not then.

I had the VHF radio in my hand before I consciously decided to use it. Channel 16, the international distress and calling channel. I had used it perhaps three times in two years at the marina, mostly to report debris drifting into navigation routes.

HM Coastguard answered my second call.

I gave the position as the disused Eilean Dearg lighthouse. I told the operator we had rescued an armed kidnapping victim, that one member of our party had fallen into a flooded tunnel connected to the sea caves, that a private contractor was missing and presumed dead, and that another armed man was unconscious below the keeper's cottage. I said the victim required urgent medical evacuation.

I kept it brief.

The operator asked me to repeat the part about the missing contractor. I did. She told me to remain on the channel.

I put the radio down and checked Imogen.

She was still against the wall near the ladder. Euan had found another foil blanket and wrapped it around her shoulders. Her hair was matted on one side, and a bruise ran along her jaw which I hadn't noticed below.

She looked up as I approached.

"Is it over?" she asked.

"Yes," I said. "They're coming."

She nodded and looked back at the floor.

Hannah had moved to a window overlooking the Sound. I stood near her for a minute. The water was flat and black. Nothing showed on it.

Whatever had waited offshore was gone. Perhaps it knew the flare had burnt out. Perhaps it simply no longer cared.

"Ross's pack has a first-aid kit," Hannah said.

"I already took it out."

"All right."

She had dressed a cut on her own forearm which I hadn't known was there. She worked quickly. She always did. That was the thing about Hannah. She was three steps ahead before anyone else knew there was a problem.

I didn't say so. There was nothing useful to say.

The first RNLI lifeboat reached the island forty-one minutes after the call. A second arrived close behind it. HM Coastguard had also sent rescue personnel and an ambulance crew to rendezvous with them.

The lifeboats came as close to the rocky landing as they could. Crew members transferred ashore in an inflatable boat and came up through the trees carrying a stretcher before I had finished signalling them in.

One of them asked who was in charge.

I said it was a complicated question.

He didn't find that funny. Fair enough.

They took Imogen first.

She kept insisting she could walk. She could. She walked to the stretcher under her own power, sat on it and allowed them to secure the straps. She looked back at the keeper's cottage once as they carried her towards the shore.

I don't know what she was looking at.

A coastguard search-and-rescue helicopter came from Prestwick. It settled in a clearing behind the lighthouse. The rotor wash flattened the grass around the broken quartz ring. Its five missing stones were now in the shaft below the cottage, and the gap I had made remained plainly visible. The silver rowan-leaf pendant still lay inside the incomplete circle.

They loaded Imogen and flew her to Queen Elizabeth University Hospital in Glasgow.

That was the last I saw of her that night.

Martin Shaw was still unconscious when the rescue team entered the tunnel. The accidental dart had struck him high in the shoulder, and the impact with the wall had opened a cut at the back of his head. They strapped him to a spinal board and hauled him up the ladder without much difficulty.

He woke in police custody. Police Scotland and the National Crime Agency questioned him later. I heard he said very little. That seemed right.

Kincaid's body was never recovered.

Police divers searched the flooded shaft and the connected cave system for three days. They found his capture device, one boot and a length of webbing from his equipment. They found no body. The sounds I had heard, his disappearance and what remained in the tunnel supported the official account that he had fallen into the submerged cave system.

The search ended on the fourth day.

I gave a statement at Oban police station saying that I had heard Kincaid fall near a flooded tunnel and had not seen him surface. That was technically accurate.

Richard Vale flew from Farnborough to Glasgow the morning after Imogen was admitted. He was at the hospital when she woke.

I know because a Northbridge Risk liaison rang me from the hospital foyer and asked whether I wished to speak to Mr Vale directly.

I said no.

The liaison called again two hours later. He said Mr Vale appreciated what I had done and that their accounts department would be in touch.

It never was.

Kincaid's promised fee, seven hundred and fifty thousand pounds, had been tied to a contract which technically did not exist. The man who arranged it was dead, and the shell company through which Northbridge Risk had invoiced the operation dissolved within forty-eight hours.

I looked into it for about a day. Then I stopped.

I'm not a solicitor, and I wasn't going to become one.

I drove back to Dunstaffnage Marina on a Tuesday, three days after the lighthouse. I parked in my usual place behind the harbour office, beside the bins that smelt of fish in every season.

I took my scraper from the Land Rover and went to berth fourteen, where a serious growth of algae had been waiting for me.

Nobody said anything.

Mick Hargreaves, the harbour manager, communicated mostly in grunts. He nodded as I passed. The tourist boats were running. A family in a hired motorboat went too fast beyond the harbour speed markers.

A normal day.

At lunchtime I drove north to see Mairi. I brought the coffee, which was my part of the arrangement. She had a fishing trade magazine open on the counter, the sort with advertisements for lures on every second page. She poured herself a cup without looking up.

"You're still in one piece," she said.

"Most of me."

Then she looked at me. She had a way of doing that which made you feel she was counting something.

"The caves?" she asked.

"Yes."

"And the other thing?"

I thought about the black head rising from the flooded shaft. The crooked antlers. The green eyes. Kincaid disappearing into the dark and never coming back.

"Yes," I said.

She nodded as if I had confirmed the weather forecast and returned to her magazine.

I drank my coffee.

That day she told me about the Each-Uisge, the old water-horse of Gaelic stories. Local descriptions varied, she said. Some gave it a horse's shape, some antlers, some only eyes above the water. The details mattered less than the warnings. It belonged to deep lochs and drowned places. It followed offerings when they were disturbed, honoured certain boundaries and feared fire. It had been patient since before anyone living had a word for patience.

She told the story as she told all of them, without haste, as though there were no reason to rush towards the ending.

I had heard versions of it before. I used to think it was a good story, the sort that gave a place character.

I didn't laugh this time.

I finished my coffee, washed the cup in her sink and returned it to its hook. She was still reading.

"Don't go beyond the caves," she said.

"I know."

"Not because of the Each-Uisge," she said. "Just because."

I didn't ask what she meant. I thought I already knew.

I returned to the marina and scraped algae until my arm ached. Then I kept going.

The Sound was flat, cold and very large. It always had been. The difference was that I used to be able to forget it.

I still arrived every morning. I still scraped the berths, shifted fuel hoses and directed visitors towards the car park. The monotony held, as it always had.

That part had not changed.

But when Mairi told her stories now, I listened differently. Not like someone enjoying a good yarn. More like someone checking a chart he wished he didn't need.

The things beneath the sea lochs were real.

They were close.

And they had been patient far longer than I had been anything at all.

That was the part which stayed with me.