AI The ladder ended forty feet down in a foot of dust, and Quinn's boots left the first clean prints she'd seen since Camden High Street.
"Mind the third rung from the bottom," someone called after her . "It's more rust than rung."
She didn't answer. She was looking at the platform.
Two arc lamps stood at either end, borrowed from the Underground's engineering crew, throwing light that turned the tiles the colour of old teeth. Cranholt Street station had shut in 1924 and nobody had bothered to tell the posters. A woman in a cloche hat still advertised cocoa above the bench. Somebody had scratched out her eyes, and it looked recent.
The body lay eight feet from the platform edge, on his back, hands folded on his chest like a man laid out by an undertaker with a schedule to keep.
"DC Sandhu." Quinn peeled off one glove with her teeth and pulled on a fresh pair. "Talk."
"Male, mid-thirties, no wallet, no phone." Sandhu had his notebook out and his collar up, and his breath came in small white clouds. "My money's on an urban explorer. They love these old stations. Get in through the vent shaft off the goods yard, take pictures for the internet, fall, break something important."
"He's not broken."
"He's not intact either, guv."
She crouched. The wound sat under the sternum, a neat oval the size of a plum, the edges puckered and grey. No tearing. No flap of skin. It looked less like a stabbing than a place where something had been unscrewed .
"Cauterised," she said.
"Chemical, maybe. Some of them carry stoves. Camping gas."
"Camping gas gives you blistering. Gives you smell." She leaned in, breathed . Under the mineral fug of a century of brake dust there was something else, thin and wrong. Burnt sugar. Toffee left too long in the pan.
Her hands went still.
Three years, and she'd never found a word for that smell. She'd written it in the margin of the Morris file in biro: *sweet, cooked, not food.* Nobody had asked her about it. Nobody ever did.
"Guv?"
"Where's the blood?"
Sandhu pointed with his pen. "Right there. Pooled under him."
"That's a saucer." Quinn traced the air above the dark stain, an inch off the concrete, mapping it. "A wound through the diaphragm empties a man like a bath. You'd have it in the tile grout, you'd have it running to the drain channel, you'd have it under the bench. This is what you'd get from a nosebleed and a bad night."
"Could've been moved. Killed elsewhere, dumped here."
"Then look at his shoes."
Sandhu looked. To his credit, he crouched and looked properly, which was why she kept him.
Brogues. Good ones, resoled. And clean. Not a smear of the pale grey dust that lay over the platform like flour over a kitchen floor, the dust that had already turned Quinn's trousers the colour of a rain cloud from ankle to knee.
"So he was carried," Sandhu said. "Two men, maybe three, down that ladder."
"Down a forty-foot ladder with a corpse and neither of them left a single print." She stood and swept the arc lamp's beam with her eyes. "There are prints. Look properly."
He did. And she watched his face change, which was the part she liked, the small collapse when a scene stopped being a story and became a question.
The dust was covered in footprints. Hundreds. Boots, bare feet, something with three toes and a long heel that she chose not to name yet. They crowded the platform from wall to edge, overlapping, layered, a market-day churn of them.
And every single one pointed away from where the body lay. Not one came towards it.
"That's not possible," Sandhu said.
"It's not impossible. It's just not what we assumed." Quinn walked the platform's length, slow, hands behind her back like a man inspecting a regiment. "See these? Rectangles. Clean rectangles, no dust inside them, edges sharp as a cut. Eleven of them. Spaced with a gangway between."
"Stalls," Sandhu said, after a moment. "Like a market."
"Trestles. Something stood here long enough to keep the dust off the concrete and then left in a hurry, and everybody left with it, all at once, all in the same direction." She stopped and tapped the toe of her boot against the tile. "Full moon was Tuesday."
"Sorry?"
"Nothing." She wasn't ready to say the rest of it out loud. Not to a man with a mortgage and a pension.
At the far end, where the platform ran into the black throat of the tunnel, the tiles wore a coating of frost. Not damp. Not condensation. Actual frost, in a ring three feet across, and it hadn't thawed in a chamber that stank of trapped summer.
She held her palm above it. Her skin prickled. Her wedding ring, worn on a chain now, went cold enough to sting through her shirt.
"Sandhu. What time did the call come in?"
"Nine-forty. Track inspector, doing a survey of the shaft."
"Check your phone."
Paper rustled, then a small confused silence . "It's dead. Full charge when I came down."
Quinn turned her left wrist over. The leather watch strap had been her father's; the watch itself she'd bought after the funeral because he'd have hated seeing an empty strap. The second hand sat rigid between the four and the five.
Three minutes past four. She'd wound it at seven that morning.
"Mine too," she said. "That's twice now."
"Twice?"
"Different case." She let it drop and went back to the body, kneeling this time, both knees in the dust, which meant the trousers were finished anyway. "His wrists."
Two bands of bruising, purple going yellow, and above them, on the forearm, four crescents where fingernails had pressed. Someone had held him, and someone else had cut him, and neither of them had left a footprint. But that wasn't the interesting part. She lifted his right hand.
The fingers had gone stiff around something, and she had to work them open with her thumb, one at a time, feeling the small resistances give.
A compass. Brass, palm-sized, the casing gone green with verdigris in the seams. Sigils cut into the face, fine as engraving on a wedding ring, none of them letters she could name. Where north should have sat, someone had scratched a small blank space and left it deliberately empty.
"Compass," Sandhu said, relieved. "Explorer. Told you."
"His pockets," Quinn said. "Left coat pocket. Go on."
Sandhu reached in and came out with three flat discs the colour of weak tea. He turned one in the light. Not plastic. Not ivory. Porous at the broken edge, and drilled through.
"That's bone," he said, and put it back down very carefully , the way a man does when his hands have got ahead of his brain.
"Currency," Quinn said. "Or a ticket."
"For what?"
She stood, and that was when she noticed the compass in her hand.
The needle had swung while she walked. It hadn't wandered, hadn't dithered the way a cheap compass does. It had turned as she turned, holding a single line, patient as a dog watching a door.
She took four steps left. The needle followed. She walked to the bench and back and it followed, pinned, unwavering , pointing away from the ladder, away from the frost ring, away from north, into the tunnel mouth where the arc light gave up and the dark started.
"Guv." Sandhu's voice had gone thin. "Guv, look at the floor."
Ahead of them, in the flour-fine dust between the last stall rectangle and the platform edge, a footprint pressed itself into being. Then another beside it. Bare. Long-heeled. Three toes.
Coming towards them.
And in the tunnel, something drew breath, and the smell of burnt sugar rolled out over the platform like a tide.