AI The bone disc came out of the dead man's coat pocket warm, and Quinn had been down in that station for forty minutes.
"Bag it," she said, and held her palm out flat until the exhibits officer laid a plastic pouch across it. She did not want to touch the thing twice. It looked like a poker chip cut from a shin, one face rubbed shiny by thumbs, the other scored with a shape that her eye kept sliding off.
"Charm," said Ferrow. "They all carry tat. Rabbit's foot, saint's medal, bit of scrimshaw off a market stall."
"He's a conservator at the British Museum."
"Museum people are the worst for it. Superstition and cardigans."
Quinn straightened. Her knees complained. South Kentish Town station had been shut since 1924, and everything about it wanted you to leave: the spiral staircase that dropped ninety-odd steps into the dark, the tiles gone the colour of old teeth, the smell of rust and standing water and something sweeter underneath it, like fruit left in a bag. The arc lamps the response team had dragged down threw everyone's shadow up the curved wall, so there were always more people in the passage than there were.
Tobias Rell lay on his back in the middle of the eastbound platform, arms at his sides, heels together. Forty-four years old. Grey overcoat, good shoes, museum lanyard still clipped to his lapel with the photograph facing outward, like a man expecting to be identified.
"Talk me through it," Quinn said.
Ferrow was happy to. He always was. He had the file open on his forearm and his tie tucked into his shirt to keep it out of the muck.
"County lines. Or the nearest thing to it. There's a crew been using the old stations off the Northern line for storage since the summer, we've had two lock-ups off High Barnet. Rell buys, Rell owes, Rell gets brought down here for a conversation that goes badly. They come in through the ventilation shaft off the Warren, drop him, go out the same way. The theatrical bit," he waved a hand at the platform, "is theatre. Somebody's seen a documentary."
"Mm."
"You're doing the noise."
"What noise?"
"The one you do instead of disagreeing."
Quinn crouched again by the body's left hand. "Where's the blood, Nick?"
"Under him."
"No." She pointed with a gloved finger, not touching. "Three wounds. Parallel. Through the coat, through the shirt, through him. That's an artery opened at the top there. That should have gone up the wall behind him like a thrown bucket. Tiles are clean. And the pool under him is the wrong shape. It's a ring." She traced the air above it. "It ran out to the edges and stopped. Blood doesn't stop at a line. It follows the fall of the floor, and this platform drains towards the track."
Ferrow looked. To his credit, he looked properly, and he was quiet for a moment.
"Killed elsewhere. Laid out here."
"Then his shoes."
"What about them?"
"They're filthy." Quinn stood and moved down the platform a few paces, into the section the lamps only half reached. "Soot to the ankle. Same soot that's on the floor here. If he was carried in, his soles are clean and his sleeves are dirty. His sleeves are spotless. He walked in on his own feet, and he walked a long way. And there's this."
She stopped at the edge of the light and let Ferrow come to her.
The dust on the platform was thick as felt, laid down over a century, and it was churned . Not smeared. Printed. Boots, trainers, a bare foot with too long a stride, something that had left a mark like a dinner plate with claws at the front. Hundreds of them, overlapping, all of them pointing the same way, up the platform, towards the bricked arch at the far end where the old passage to the lifts had been sealed .
"Crowd," Ferrow said. "Urban explorers. Rave, maybe. That'd fit."
"Count the returns."
"Sorry?"
"Every print goes one way." Quinn kept her voice level, because level was the only voice worth using in a hole in the ground. "Towards that wall. Not one comes back. And the staircase we came down, the only way in that isn't a sealed shaft, had my footprints on it and the response constable's and nothing else. Ninety-three steps of undisturbed dust. Nick. Hundreds of people got onto this platform without using the stairs, and none of them left."
Ferrow's jaw worked. He had eleven years in and a good clearance rate and he wanted, she could see it plainly, for her to stop.
"The shaft," he said.
"Grille's fixed with 1957 rivets and it's got a spider's web across it I'd frame and hang on a wall."
"Then there's another way in and it's not on the drawings, which happens, Harlow, this is the Underground, the drawings are a work of fiction." He snapped the file shut . "It's Wednesday. I've got a chief super who wants a name by Friday. I'll take gangs and a dump site over a hundred invisible ravers."
"Take what you like." Quinn walked to the arch.
Somebody had bricked it up properly, English bond, mortar gone crumbly and grey. She put her hand flat on it. Cold, then not cold. A draught came through the joints, and it should have smelled of the tunnel, of iron filings and mice. It smelled of woodsmoke and cut grass and, faintly, of frying onions. It smelled like the top of a set of stairs on a summer evening in a city that wasn't this one.
The dust on the floor in front of the arch had been pressed into a threshold, a worn dip, the way a stone step wears under a church door.
Traffic. Years of it.
Quinn made herself breathe out slowly and turned back along the platform, and this time she read the body the way you read a page rather than a picture. Fine white powder on both shoulders of the coat, gritty when she rubbed it between her fingertips through the glove. Not soot. Salt. His watch, a cheap steel thing, stopped at 11:19, and the hands sat crooked, as if the movement had been wrenched rather than run down. And in the inside breast pocket, along with a fold of receipts, a slip of paper with two punched holes and a library hand.
READER REQUEST: RESTRICTED ARCHIVES.
Vellum fragment, uncatalogued. Bequest 1889.
Retrieved by: E. Kowalski.
Returned: NOT RETURNED.
"Nick." She held it up . "He signed something out of the museum eleven days ago and never took it back. And whoever fetched it for him has a name and a desk and a swipe card."
Ferrow read it over her shoulder. "That's a witness, that's useful, that I can work with." Then, grudging, "What do you think happened?"
"I think he came down here to meet somebody. I think a great many others came down here for the same reason and they all went out through a wall. I think he was the only one who couldn't."
"Walls don't."
"No," Quinn said. "They don't."
She said it, and thought about a bricked-up alcove in a basement in Whitechapel three years earlier, and DS Morris turning to grin at her over his shoulder with white grit in the turn-ups of his trousers, and the eleven seconds of nothing that had followed. Eleven seconds she had never been able to fill in, and a coroner's report that had used the word "presumed" four times.
Her hand had gone into her own coat pocket without asking. The brass compass she had taken off a boy in Southwark last spring lay there, warm as the bone token had been, green with verdigris around the rim, its face crowded with little scratched marks she had photographed and shown to nobody.
The needle was spinning .
It had never done more than tremble. Now it whirled like a fan, ticked, and stopped hard, pointing past her, over her shoulder, at the bricked arch.
The nearest arc lamp browned out. Then the second. The third went with a bang and a smell of hot glass, and the dark came in over the platform like water finding a level.
"Generator," Ferrow said, too fast. His torch beam jerked up. "It's the bloody generator."
The mortar in the arch cracked with a sound like knuckles, all at once, along every joint.
And in the black at the tunnel mouth, out where the rails ran towards Camden, Quinn's radio hissed, cleared, and spoke in a voice she had buried.
"Harlow. Don't let him open it."