AI The rain found the gap between Quinn's collar and her neck somewhere on Camden High Street, and it lingered there, a cold thread trickling down her spine with every stride. It streamed from her cropped salt-and-pepper hair and off her sharp jaw. She narrowed her brown eyes against it and kept them fixed ahead. Beneath the sodium lamps, the Saint Christopher medallion at Tomás Herrera's throat swung on its chain like a metronome, the patron saint of travellers winking each time he glanced back over his shoulder. He glanced back often. Each time, the gap between them had grown by a yard.
Forty minutes earlier she had been standing on the far side of Greek Street, watching water spill off the lip of the green neon sign above the Raven's Nest. Through the streaked window she could make out the old maps and black-and-white photographs crowding the walls. She had spent eight months building a file on the people who drank beneath them, beginning with Silas, who owned the place and was never there when she came looking. In her notebook she called them the clique, though not one of them had ever admitted to belonging to anything. Herrera had walked out with his hands buried in his coat pockets, seen her across the road, and simply run. She had chased him through Soho and lost him on the Euston Road. She had found him again only because his cab had jammed behind a bus on Camden High Street, and he had been fool enough to climb out and sprint.
The stalls of Camden Lock loomed on her left, tarpaulins sagging, shutters chattering in the wind. Fried onions and wet tarmac. A bass line thudded through the wall of a pub and drowned in the downpour. Herrera cut between two shuttered units and took a flight of iron steps down toward the canal two at a time. Quinn followed, one hand skidding along the freezing rail, the leather strap of her watch sodden against her left wrist.
The towpath opened beneath a bridge, a strip of wet cobbles hemmed by black water. The canal had swallowed the lamplight and was giving back only a shivering, broken copy of it. Rain pocked the surface in a thousand small impacts. Herrera's footsteps smacked off the stones and came back at her from the brick.
"Mr Herrera!" Her voice cracked against the arches. "Metropolitan Police. Stop where you are."
He didn't stop. He threw a look over his shoulder, dark curls plastered flat, olive skin gleaming , warm brown eyes gone wide, and flung his left arm out for balance. The sleeve rode to his elbow. The scar along his forearm showed pale in the lamplight, a raised rope of tissue from wrist to elbow, the kind of mark a man carried from a blade he never saw coming.
She had read his file twice. A paramedic once, with a clean record and a clean licence. Then a complaint from a hospital in Whitechapel, a hearing, and the licence gone for treatments no one had authorised: patients who appeared on no hospital's books and who, the complaint had hinted, were not entirely human. Eleven months later, a courier had been dragged out of this same canal with his chest stitched shut. The stitches had been immaculate. The thread had shone like wire.
Ahead, the towpath ran beneath a railway viaduct, and beyond it the arches began: a curving row of old brick, most of them bricked up, a few fronted with corrugated iron that rattled whenever the wind found it. Herrera slowed at the fourth. Quinn closed the distance at a run, boots slapping, lungs sawing, and stopped six feet short of him. Her body did what it had been drilled to do: weight low, hands loose, eyes counting exits. The only exit she could see was the canal.
The arch had been hoarded over with plywood. Above the boards, a square of enamel had survived the years, its paint gone the colour of old teeth, its lettering half scoured away. Only the ghost of the old red roundel still showed around the letters.
"Go home, Detective," Herrera said. He was breathing hard, but his English came out careful and polished, with the vowels of Seville still underneath. "Please."
"Step away from the boards, Mr Herrera."
"You don't understand what's on the other side."
"Then explain it to me."
He laughed, a short sound with nothing in it. Beneath the saint on his chain, a second cord had slipped free of his collar, black and thin, and at its end hung a pale oval that gleamed like a tooth.
"There's a girl in there with a hole in her side the size of my fist," he said. "I'm the only one who can close it without a hospital asking questions nobody can answer. You want to arrest me? Fine. Do it in an hour. She won't be alive in an hour. If she dies, that's on you."
"Then tell me what happened to her."
"Something that doesn't go in your notebook." His gaze dropped to her coat, to the pocket she didn't realise she was touching. "You lost someone, Detective. Three years ago. A partner."
The words struck her under the ribs with a precision that had nothing to do with the rain. Quinn kept her face still, which cost more than it should have. "Don't."
"Down there, everyone knows what everyone has lost. That's what they sell."
He lifted the pale oval and pressed it flat against the brick beside the boards. Only then did she see the mark scratched into the mortar: a spiral, tight as a fingerprint, ending in a hook.
The brick softened. There was no better word for it. The mortar shivered like the surface of a pond, and a seam opened down the middle of the arch, through the plywood and the brick behind it, with a sound like breath drawn through teeth. Warm light spilled out, gold and wrong, carrying music that never quite resolved , the murmur of a crowd speaking several languages at once, and a smell of cloves and wet stone and, beneath those, something sweet and turning, like lilies left a week too long in a vase.
Herrera stepped into the gap. On the threshold he turned, one hand braced on the frame, and looked back at her. Rain ran off his chin. "Last chance," he said quietly . "Down there, your warrant card is a bit of tin."
Then he was through, and the seam began to close.
Quinn was moving before she had decided to move. She reached the gap as it narrowed to the width of a hand, warm air gusting over her face, and glimpsed steps descending into the glow, worn into shallow troughs by feet long since gone, a curve of white tile, and a lantern swinging on a wire. Then the seam sealed. Brick. Rain. The hiss of the canal.
She stood with her palm flat against the arch, breath smoking in front of her, and made herself think the way she had been trained to.
Radio first. Her fingers found the handset on her belt. She thumbed the transmit button and got a crackle, a long dead hiss, then a shred of a dispatcher's voice that broke apart before it formed a word. Whatever lay beneath this viaduct was swallowing the signal. Even if she got through, a unit would take twenty minutes to find a railway arch that appeared on no map she had ever seen. By then Herrera would be gone, and whatever waited in there would be gone with him.
Procedure said wait. Eighteen years in the Met had given her a rulebook, and she knew every page of it. It said log the entry, request a team, go in with four officers and a plan. It had been very clear three years ago, in a basement in Stepney with something breathing in the dark. She had followed the rulebook right up to the moment she went in with Morris at her shoulder. She had come out alone. Nobody, not the coroner, not the review board, not the two men who had questioned her for nine hours in a windowless room, had ever been able to tell her what had happened to him.
Her right hand went to the pocket of her coat, and her fingers closed on a small, flat, cool shape she had never logged.
It had been sewn into the lining of Morris's jacket. She had found it when she bagged his effects, zipped inside a hidden pocket, the way a man hides something he doesn't want found. She had meant to put it in the evidence bag with his wallet and his keys. Instead she had slipped it into her own pocket and told herself it was sentiment. She had never told anyone. She had never once taken it out and studied the spiral etched into its face.
It was warm. That was the part she could not explain. The night was cold enough to ache in the joints, and the bone token in her palm was as warm as a living hand.
She could walk back up to the Lock, call it in, and wait for a team that would never find this arch. Her informant had called the place the Veil Market, a bazaar that never stayed in one spot longer than a month and always moved with the full moon. Tonight was the full moon, hidden somewhere above the cloud. By dawn this arch would be a wall again, and whatever lived behind it would be somewhere else. Or she could go down and find out what had taken Morris, and what had sewn that courier's chest shut with thread like wire. Herrera had known his name. Someone down there knew it too.
She had no map, no backup, and no idea what the rules were. She didn't know what was waiting at the bottom of those stairs. That was the problem. It was also the reason.
Quinn drew one breath that tasted of rain and canal water, and pressed the bone to the spiral on the brick.
The mortar softened beneath it. The seam reopened slowly , as if the arch were considering her, and then it parted all at once, and the warm air rolled out to meet her.
She stepped through.
Behind her the seam shut with a sound like a book closing. In the same instant her watch stopped. She looked down. The second hand, which had ticked steadily all evening, juddered once and froze at twelve minutes past one.
The stairs went down farther than the arch had any right to allow, and the air thickened with every step: clove smoke, cold stone, the sweet rot of flowers. Quinn kept one hand on the wall. It was tiled in faded white and grimed to the colour of weak tea, and in places she could still make out black lettering, the names of stations that had been shut for longer than she had been alive. Halfway down, a figure in a long oilskin coat passed her without touching the rail, and did not look at her face.
At the bottom, the old platform opened into a cavern of lantern light and haze. Stalls ran along both sides of the track bed: trestle tables draped in black cloth, crowded with bottles, jars and objects that were neither. Vials glowed faintly blue and gold, like bottled dawn. A man with a shaved head sold powders from unlabelled glass, one jar marked in Latin with a warning she did not need translated. A woman in a grey shawl sold small folded papers, and Quinn realised with a lurch that she was selling names. Across the far wall someone had chalked a board in neat, looping letters.
INFORMATION. PRICE NEGOTIABLE.
And beneath it, smaller: WHAT HAVE YOU LOST?
Quinn stood still in the crush of voices and searched the crowd. For a moment she saw nothing but coats and hoods and the glimmer of glass. Then she caught a flash of silver at a throat, a dark curl of hair bobbing above the heads at the far end of the platform. Herrera was moving toward a pillar wreathed in smoke. He glanced back once. His expression was not triumph. It looked almost like pity.
Then the smoke took him.
"Careful with that one."
The voice came from the nearest stall. An old woman sat behind a tray of yellowed teeth, her eyes gone white as milk. She was looking at Quinn's fist, where the bone token was pressed hard against her palm.
"It's been down here before," the woman said.
Quinn's mouth had gone dry. "Who did it belong to?"
The old woman smiled, showing gums and a single gold tooth. "Information costs more than that, dear."
Quinn slid the bone into her pocket, where it lay against her hip, warm as a coal. Around her the crowd, which had been talking loudly and all at once, fell quiet, and then, one head at a time, turned to watch her go.