AI Detective Harlow Quinn ducked beneath the rusted lip of a service hatch and dropped six feet onto the platform below.
Her boots struck old tiles with a hard crack. The sound rolled down the abandoned station, bounced off soot-blackened arches, and died somewhere beyond the dead tracks. Above her, Camden traffic muttered through layers of brick and earth, a city pretending nothing waited underneath.
A uniformed constable shone a torch into her face. Young. Pale. His helmet sat crooked, and his right hand kept worrying the strap.
“Detective Quinn?”
Quinn tilted her chin until the beam slid off her eyes.
“Lower it before I start taking names.”
The torch dipped at once.
“Sorry, ma’am. DCI Roper sent for you. Body’s this way.”
Quinn pulled her gloves from her coat pocket and snapped them on as she followed him along the platform. Her worn leather watch sat tight against her left wrist, its cracked face catching brief slashes of torchlight. The station name had been painted over decades ago, but old letters bled through in patches beneath peeling cream paint. CAM. EN. Something had scraped a crescent through the grime on the wall, fresh enough that pale plaster still powdered the floor beneath it.
Not a station, then.
A mouth.
At the far end of the platform, portable floodlights stood in a rough semicircle around the ticket hall. Their glare turned the tiled walls a sick hospital white. Evidence markers dotted the floor between puddles of black water, discarded wrappers, candle stubs, and things Quinn did not yet have names for. A tarpaulin had been taped across one archway, but it flapped in the draught and showed glimpses of narrow passages beyond, each crowded with shuttered stalls and hanging signs painted in languages that had no business existing under north London.
The Veil Market.
She had heard the name in whispers for three years, always after a body turned up wrong, after CCTV failed, after witnesses forgot their own names mid-sentence. She had filed it under nonsense until nonsense started leaving fingerprints.
A man in a forensic suit rose from a crouch near the body. Broad shoulders. Shaved head. A pen tucked behind one ear. DS Callum Price gave her a nod over his mask.
“Took your time.”
“Had to find someone upstairs willing to admit this place was real.”
Price’s eyes creased.
“Still working on that myself.”
Quinn stopped at the edge of the taped scene and scanned the hall without stepping through. Old ticket barriers stood in a row, green paint blistered from their metal arms. Beyond them, market stalls had been built into the concourse: crates, bead curtains, apothecary shelves, cages covered in embroidered cloth. One stall had collapsed inward, its awning slashed. Another displayed rows of empty glass vials, each labelled with faded ink. The air held damp concrete, burnt sugar, mould, hot metal, and something sharp enough to sting the back of her throat.
“What have we got?”
Price pointed with his pen.
“Male victim. Late fifties, early sixties. No ID. Found by a trespasser at 04:16, though the trespasser bolted before uniforms got a statement. Fatal wound to the chest. Looks like a blade, narrow and deep. Purse untouched, watch untouched, ring untouched. No obvious robbery.”
Quinn looked at the body.
The dead man lay on his back between the ticket barriers and a stall marked in curling silver script. His coat was expensive and ruined, dark wool spread open around him like a torn wing. His shirt had been cut at the chest by the paramedics, though no one had pretended to save him for long. Blood soaked the fabric from a single wound just below the sternum. His mouth hung open. His eyes had filmed but still pointed at the ceiling tiles above him.
His left hand clenched something.
Quinn stepped under the tape.
“Pathologist?”
“Forty minutes out. Flooding on the Euston Road.”
“Convenient.”
Price crouched again by the body.
“I’m calling it a market dispute. This place screamed illegal trade. Someone got cheated, someone used a knife, everyone else vanished before the Met arrived. Simple.”
Quinn’s gaze moved from the body to the tiles around him.
“Nothing about this place screamed simple.”
A camera flashed behind her. SOCOs worked in silence , white suits rustling like paper bags. One photographed the wound. Another dusted the ticket barrier. The constable at the stairs kept looking at the covered stalls as though one might look back.
Quinn lowered herself beside the victim, her knees clicking once. She ignored it.
“Show me the weapon.”
“No weapon recovered.”
“Blood trail?”
“None beyond this pool.”
“Signs he crawled?”
“No.”
Quinn’s gloved fingers hovered above the dead man’s coat without touching.
“Then he died where he fell.”
“That’s my read.”
“Your read needs glasses.”
Price gave a small sniff.
“Go on, then.”
Quinn leaned closer to the victim’s chest. The wound had a neat oval mouth, but the shirt around it had browned at the edges. Not burnt. Dried too fast. The skin surrounding the cut puckered in a faint ring, pale against the blood.
“Blade went in straight. No hesitation marks. No defensive wounds?”
Price lifted the victim’s right sleeve with his pen.
“None I saw.”
Quinn checked both hands. Fingernails clean. No torn skin. No broken knuckles. His palms showed no scrapes from a fall.
“He knew the killer.”
“Or got ambushed.”
“No.” Quinn’s eyes moved to his face. “Look at him. Mouth open. Eyes up. Arms loose except the left. Shock, not struggle. He stood here and let someone close.”
Price shifted, the plastic of his suit whispering.
“People let traders get close. Especially if they’re buying.”
Quinn looked towards the stalls.
The closest one had survived intact. Its counter carried a layer of dust disturbed by three clean rectangles, as if boxes had been removed in haste. Behind the counter, shelves held bundles of dried herbs, bone charms, cracked porcelain bowls, a jar of moth wings, and a velvet pad with circular impressions pressed into the nap.
“What was sold there?”
“No idea. Sign’s not English.”
“It isn’t any modern language.”
Price stared at her.
“You reading those now?”
“I’m reading what’s missing.”
She stood and crossed to the stall. The floorboards behind the counter bowed under her weight . Several small drawers sat half-open. Someone had searched them fast, but not like police and not like a thief. A thief took broadly. This person had known where to look and been angry when it wasn’t there.
She lifted a drawer with two fingers. Dust lined the bottom except for a clean, compass-sized circle.
Price came up beside her.
“Could have held anything.”
Quinn turned her head.
“Circular. Brass stain on the wood. See the green?”
Verdigris had marked the drawer in a faint ring.
“A compass?”
“Small one.”
Price’s face changed, but he smoothed it over too late.
“You’ve seen that before.”
Quinn said nothing. Three years ago, DS Morris had died in a warehouse in Wapping with no wound a doctor could explain and a smear of green brass oxide under his thumbnail. Quinn had spent a month chasing antique dealers, dockworkers, occult cranks, and one museum assistant with round glasses who knew too much and lied badly.
Eva Kowalski.
“What else has been moved?” Quinn asked.
Price pointed to the collapsed stall.
“Over there. We thought the fight started there. Shelving smashed, crates overturned, blood on the floor.”
Quinn crossed the hall. Water had seeped through cracks in the ceiling and collected in shallow pools. Her boots left prints in the grime, but dozens of older marks crossed beneath them. Some human. Some narrow and pointed. Some circular, like canes. The market had been busy before it vanished.
At the collapsed stall, evidence markers huddled around broken planks and spilled powder. A red smear streaked the floor near a crate of black glass beads.
Quinn crouched. The blood there had dried thin, sprayed in droplets that pointed away from the body, not towards it. She traced the angle with her eyes.
“This isn’t from the victim.”
Price folded his arms.
“Lab hasn’t confirmed.”
“Doesn’t need to. His wound bled down and pooled under him. This smear came from a moving source. Low to the ground. Someone bleeding passed here before he died.”
“So we’ve got an injured killer.”
“Or another victim.”
Price’s jaw worked.
“No second body.”
“Then someone removed them.”
He laughed once, without humour.
“In a sealed station?”
Quinn looked past him to the archways screened by tarpaulin.
“Sealed by uniforms who arrived after everyone left.”
A gust pushed through the hall. The tarpaulin snapped against the tile. Every torch beam jerked towards it.
The young constable swallowed.
“Wind, ma’am.”
Quinn’s brown eyes stayed on the plastic sheet.
“Underground stations breathe through shafts. That gust came horizontal.”
Price followed her gaze.
“Maintenance tunnel?”
“Market entrance.”
She stepped towards the tarpaulin. Beneath it, chalk marks scratched across the tiles in a half circle. Someone had tried to scrub them out with water and failed. The lines looked like a map and a wound at once .
Price caught her sleeve before she lifted the sheet.
“Quinn. We haven’t cleared beyond there.”
She looked at his hand. He removed it.
“Then stay behind me.”
The passage beyond the arch stretched between rows of market stalls, each shuttered with iron grilles. Signs swung overhead though no breeze touched them now. Charms hung from strings: teeth, coins, feathers, tiny bottles sealed with wax. Some had been crushed underfoot. Others had been arranged on the ground in small piles at the base of each stall.
Not abandoned. Packed up.
Evacuated.
Quinn’s torch swept across the walls. More scratches. Deep grooves gouged into the brickwork at shoulder height, all travelling in the same direction: towards the ticket hall.
Price came close behind her.
“Looks like someone dragged something heavy.”
“No. Drag marks scrape low.”
Quinn put her gloved fingertips near one groove. She did not touch.
“These were made by someone steadying themselves.”
“With claws?”
“With rings.”
Price bent nearer. In the groove, dull flakes of metal glittered.
“Silver?”
“Nickel. Cheap plating.”
He glanced back towards the body.
“Victim wore a ring.”
“Gold. Right hand. No plating loss.”
Quinn moved another few feet down the passage. The floor changed from tile to compacted soot. Footprints pressed clear in it. Police boots muddied the first section, but beyond them lay an undisturbed pattern: the victim’s polished shoes coming from the market side, a second set of smaller boots facing him, and then nothing.
Price pointed.
“There. The killer stood in front of him.”
Quinn crouched.
“Count.”
“What?”
“The prints. Victim came in. One, two, three, four, five. He stopped. Smaller boots stood here already. Then the victim stepped back twice.”
She angled her torch.
“Not from fear. Look at the heel depth. He shifted weight to make room.”
“For who?”
Quinn’s beam found a faint curve in the soot between the two sets of prints. A circular object had sat there, no wider than her palm. Around it, the soot had blown outwards in thin rays.
“For whatever opened between them.”
Price stared at the mark.
“You’re saying they used some kind of device.”
“I’m saying a circular brass object was taken from a stall, placed here, and activated. The victim faced it willingly. Then something went wrong.”
The word wrong hung in the cold tunnel.
From the ticket hall, a SOCO called out.
“DS Price? Found something in the victim’s hand.”
Quinn walked back fast.
The forensic tech had eased the dead man’s fingers open just enough to photograph what lay in his palm. Not a weapon. Not money. A bone token, oval and polished from use, marked with a tiny drilled hole at one end. Dark fibres clung to it.
Price leaned over Quinn’s shoulder.
“Entry token?”
Quinn looked at the stall signs, the shuttered grilles, the piles of charms left at thresholds.
“Not his.”
“He needed it to get in.”
“He’d have kept it in a pocket, not crushed in his fist while dying.”
She nodded to the fibres.
“Cord snapped. He tore it off someone.”
Price’s eyes moved to the red smear by the collapsed stall.
“The injured person.”
“Smaller boots. Nickel rings. Wore the token round their neck.”
Quinn turned the victim’s left wrist with care. Under the cuff, a narrow smear of grey powder marked his skin.
“What’s that?”
She lifted his sleeve higher. The grey powder formed a partial handprint, four fingers across the inside of his wrist.
“Someone grabbed him.”
“Victim grabbed the killer, killer grabbed back?”
Quinn shook her head.
“The angle’s wrong. This hand pulled him forward.”
“To stab him?”
“No.”
She stood and stepped back, placing herself where the smaller boots had stood, facing the imagined victim. She raised one hand as if gripping a wrist, then drew it towards her .
“To stop him stepping back. To keep him near the opening.”
Price watched her reconstruct the movement.
“Opening?”
Quinn looked at the dead man’s chest.
The wound sat low, centred, narrow. Too clean for a panicked blade. Too bloodless at the edges for steel alone.
“He wasn’t stabbed by a person.”
Price’s mouth tightened.
“Careful.”
“You called me down here because the evidence offended you. Don’t start flinching now.”
She pointed at the wound.
“No weapon. No defensive injuries. Burnt-dry tissue around a puncture. Powder handprint from someone pulling him forward. Circular mark in the soot. Missing compass. Blood from another person moving away before the victim died. Evacuated market. Scrubbed chalk. This wasn’t murder during a market dispute.”
“Then what?”
“A transaction.”
Price’s face hardened.
“With a supernatural what, portal? Rift?”
A torch flickered overhead. One of the floodlights buzzed, dimmed, then came back white and harsh. Nobody moved for a beat.
Quinn adjusted the cuff over her watch .
“You said that. Not me.”
The young constable approached with a plastic evidence bag held at arm’s length.
“Ma’am. Found under the barrier. Thought it was rubbish.”
Inside the bag lay a shard of brass no longer than a thumbnail. Green patina clung to one edge. The other edge had sheared black, as if heat had bitten through it. Tiny protective sigils, half melted, curved across the surface.
Quinn took the bag and held it to the light.
The symbols matched the sketches Eva Kowalski had once tried to hide beneath a museum ledger. Not exactly, but close enough that Quinn’s jaw set.
Price read her silence .
“Compass?”
“Part of one.”
“The missing one?”
Quinn looked past the body towards the scrubbed chalk marks. The dead man had not come here to buy trinkets. He had come to be shown a door. Someone with a bone token had brought him in, placed the compass between them, and opened something beneath Camden. Then the device had broken, the helper had bled, and the market had emptied before human police found the stairs.
Price rubbed a hand over his scalp.
“If the killer wasn’t human, our report’s going to be short.”
Quinn handed the evidence bag back to the constable.
“Our report says the victim died during the unlawful use of an unidentified device. Suspect left injured, on foot, wearing nickel-plated rings and missing a bone entry token. They knew the market layout. They knew the victim. They came for the compass or for what it pointed at.”
Price frowned.
“You’re leaving out the portal.”
“I’m leaving out words that get files buried.”
A SOCO beside the body cleared her throat.
“Detective. There’s something else.”
She had cut the victim’s shirt wider. Beneath the blood, ink marked the man’s skin. Not a tattoo. Fresh writing, drawn in black across his ribs and smeared by the paramedics’ gloves. Quinn crouched again.
The marks formed numbers and letters in a cramped hand.
E.K. — RESTRICTED — B.M.
Price leaned in.
“Initials?”
Quinn’s face gave nothing away.
British Museum. Restricted archives. Eva Kowalski.
The dead man had carried the name under his shirt like a note meant to survive him. Or meant to damn someone else.
Price looked at her.
“You know an E.K.?”
Quinn rose. Her shadow cut across the body and reached the old ticket barriers.
“Bag the shirt. Photograph every mark before the pathologist touches him.”
“That wasn’t an answer.”
“No.”
Price held her stare.
“Quinn.”
She stepped around him and studied the victim’s polished shoes, the soot on the soles, the faint crescent of green brass dust caught in the left trouser cuff. One detail had waited there, quiet and patient: the dust had settled on the front of the cuff, not the back. The compass had shattered while he faced it. The force had blown towards him.
He had not opened the rift.
He had stood on the wrong side of it.
“The smaller boots didn’t kill him,” Quinn said.
Price blinked.
“You just built a whole case around them.”
“I built a scene around them. Different thing.”
She walked to the circular soot mark and pointed to the two retreating prints behind the victim’s stance.
“He stepped back twice to make room, then someone pulled him forward when the device activated. Not to hold him in place. To save him from being caught in the blast.”
Price came to her side, slower now.
“Then the injured person was helping him.”
“Until the compass failed.”
“And the fatal wound?”
Quinn looked up at the tiled ceiling. Directly above the body, one panel had cracked in a starburst. In its centre sat a tiny black puncture, no wider than a finger.
She raised her torch. The beam caught a thin line descending from that hole to the victim’s chest: not wire, not thread, but residue suspended in the damp air, glittering dark when the light struck it.
“Not a blade,” she said.
Price followed the line with his eyes.
“What is that?”
Quinn’s voice flattened.
“Something came through first.”