AI The body sat upright in the ticket booth of a station that had closed in 1962.
Detective Harlow Quinn ducked under the tape and let her torch beam crawl across the tiled wall, past a poster for Bovril so faded it read only VRI, and settled it on the dead man's face. He looked comfortable . That was the first thing wrong.
"Constable, who called this in?"
"Anonymous." PC Ndiaye kept both hands wrapped around his own torch like it might bolt. "Landline. Box outside the kebab shop on Camden High Street. Male, said there was a man dead in the old station and then hung up."
"Time?"
"Two fourteen."
"And we got down here how?"
"Grille was already cut, ma'am. Bolt cutters, forensics reckon. Recent."
Quinn crouched and looked at the concrete under her boots. Dust the colour of ash, thick as a carpet, undisturbed for six decades in most places. Somebody had walked through it. Several somebodies, but the tracks bothered her, and she couldn't say why yet, so she filed the itch and stood.
"DS Whitlock down here?"
"Platform level."
She took the stairs. The tiles gave way to brickwork sweating condensation, and the air changed with each step, from damp to something older, mineral and sweetish, like a coin held too long in a fist. Her torch found rails at the bottom, rusted to the colour of dried blood, and beyond them a black tunnel mouth breathing cold at her.
Whitlock stood in the middle of the platform with a clipboard, looking pleased.
"Overdose," he said.
"You've been down here forty minutes."
"Forty-five. Look at him, Harlow. Camden's finest tradition. Junkie finds a hole in a fence, junkie crawls in for privacy, junkie meets his maker sat on a stool. We've had three in that squat behind the lock this year."
"He's wearing a watch ."
"So?"
"Rotary. Nineteen fifties, steel, and he's still got it." She turned and started back up the stairs. "Junkies get robbed, Marcus . Dead ones get stripped."
The ticket booth had a window with the glass long gone and a wooden shelf worn into a shallow trough by twenty million pairs of hands. The dead man sat behind it on a stool with his back straight and his hands folded in his lap. Male, sixties, grey overcoat, tweed under it. Shoes polished. That was the second thing wrong. Nobody who came down here on purpose polished their shoes.
Quinn snapped on gloves and lifted the left wrist. Cool. Stiff at the joint, not fully rigid.
"Six hours, maybe seven," she said. "Whitlock, what time did rigor set in on your last overdose?"
"I'd have to check the file."
"You'd have to open it." She turned the hand over . Nails clean, cuticles neat, a callus on the middle finger from a pen. "He wrote for a living. Or wrote a lot, anyway."
"Could still be a user."
"Could be." She rolled the sleeve . Skin like paper, no tracks, no bruising in the crook of the elbow. She checked the other arm. Same. "Show me the needle."
Whitlock's pause lasted a beat too long.
"There isn't one."
"There isn't one."
"There's a bottle." He pointed his torch at the floor beside the stool, where a small brown glass vial lay on its side, stopper missing. "Forensics bagged the stopper. Photographed in situ. It's laudanum or something like it, that's the smell."
Quinn knelt beside the vial's chalk outline and put her face close to the concrete. Aniseed. Aniseed and something under it, hot and metallic, like a struck match. Nothing like opium.
"Where's the spill?"
"What?"
"He drinks it, he drops the bottle, the bottle rolls, we get a spill." She swept the torch across the dust. Clean. Not a drop, not a stain, not so much as a darker patch. "Unless he drained it. Sixty year old bottle of god knows what, drained to the last swallow, and then he sets it down gently enough to roll instead of smash." She sat back on her heels. "And then he arranges himself on a stool with his hands in his lap."
"People do strange things dying."
"People do desperate things dying. This is tidy."
She stood and made herself look at the whole booth instead of the body in it. The dust on the shelf. That was where the itch had been waiting for her. Sixty years of it, and a bloom of clean wood in the middle, roughly a foot square, edges sharp.
"Something sat here. Something with a flat bottom, and it sat here long enough to keep the dust off, and then somebody took it away."
"Or he brought it with him and took it out again."
"To where, Marcus ? He's dead."
Whitlock had no answer to that, so he wrote something on his clipboard, which was what he did instead.
Quinn walked the tracks of the dust. Two sets of shoes leaving, one set arriving. She followed the arriving set with her torch beam low and raking, the way you learn to read a floor. From the cut grille, along the corridor, into the booth. Heel to toe, even spacing, weight forward. A man walking on his own feet, unhurried, unafraid, straight to the stool.
And then the leaving prints. Both sets came out of the booth. Both sets were the same shoe.
"He walked in once," she said, "and walked out twice."
"That's not funny."
"I'm not being funny." She crouched and set her torch on the concrete so the light ran flat and long, and the tread patterns stood up out of the dust like relief carving. Same herringbone. Same worn spot at the outer edge of the right heel. "Two men in the same shoes, same wear, same stride. Or one man twice."
Whitlow said nothing. She heard him swallow.
"Turn the body," she said.
"Forensics-"
"Photographed in situ. Turn him."
They tilted the dead man forward together, and Quinn put her torch on the back of the overcoat. No blood. No damage. But between the shoulder blades, pressed into the wool as though the coat had spent hours under something heavy, sat a shape she recognised without wanting to. A circle. Inside it, faint lines, the sort of geometry you find on old church floors and nowhere sensible.
Her thumb found the leather strap of her watch and worried it.
"That's a crease," Whitlock said.
"It's a brand." She leaned closer . The wool inside the circle had gone stiff and grey, the nap burned flat. "Something hot did that. Through the coat and not through the man, because look at his back, there's not a mark on him."
She let the body settle and stripped a glove and held her bare hand over the coat. Cold came off it. Not the damp cold of the tunnel. A dry cold, like the inside of a freezer, and it moved. It crawled up her wrist and stopped at the base of her thumb as if it had found a wall.
DS Morris had complained of cold hands. For eleven days before he vanished, in July, in a heatwave, he had sat in the car with the heater on and rubbed his palms together and laughed about circulation.
Quinn pulled her hand back and put the glove on.
"Marcus . Who's down here besides us?"
"SOCO's up top, packing. Ndiaye's on the grille. Why?"
"Because there's a light in the tunnel."
He turned. Down past the platform edge, forty yards into the black, something small and steady glowed a foot above the rails. Not a torch beam. No cone, no spill. Just a point of green, the colour of old brass held to a flame.
It was moving towards them.
"Ndiaye," Quinn called up the stairwell, not loud. "Radio for backup and get out."
No answer.
"Constable."
The grille at the top of the stairs rang once, softly , like a struck bell, and then the dust on the ticket shelf lifted itself into the air and hung there, and in the booth behind her, the dead man's polished shoes scraped the concrete as he stood up.