Run: 2026-07-01-01KWEA9ZQ9V66947AB3CNTAHD2

The address had come through at half four in the morning, scrawled on a call log that made no sense to anyone at the station — a flat above a defunct locksmith's on Chalk Farm Road, reported by a neighbour who'd smelled something through the floorboards. Quinn climbed the narrow stairwell with her torch cutting through dust that hung motionless in the air, like it hadn't been disturbed in years despite the building being occupied. The door to the flat stood open. Frost rimed the inside of the frame, thick as the kind that formed on a freezer left unplugged for a week, except it was July and the heatwave outside had turned the tarmac soft. "Detective Quinn." DS Patel straightened from where he'd been crouched by the body, notebook in hand. "Victim's male, early thirties, no ID on him yet. Landlord says the tenant's name was Halloway. Moved in eight months back, paid cash." Quinn crossed the threshold. The man lay on his back in the centre of the room, arms flung wide, mouth open like he'd been trying to shout something out before he stopped being able to shout at all. A ring of salt circled the body, unbroken except for one gap no wider than a boot print. "Gas leak," Patel said. "That's my read. Look at the state of him — no visible wounds, no blood. Pupils blown. We had a case in Lewisham last winter, same presentation, turned out to be a faulty boiler." "Where's the boiler in this flat?" Patel checked his notes, flipped a page. "There isn't one. Storage heaters." "So there's no gas line to leak from." "Could be carbon monoxide from next door, seeping through a wall cavity." Quinn crouched at the edge of the salt ring, careful not to disturb it, though something told her the disturbance had already happened, whatever it was. The salt wasn't table salt. It caught the torchlight with a faint blue shimmer, coarse-grained, laid down in a hand that hadn't been shaking. "You don't lay a perfect circle like this while you're choking on fumes," she said. "Look at the grain size, Patel. Consistent, deliberate. Someone did this on purpose, and they did it before whatever killed him." "Or he did it himself. Panic response. People do strange things when they can't breathe." She didn't answer that. Her eyes had caught the walls. Every window in the flat had been painted shut, layers of black gloss built up over what looked like years, but the paint tin sitting in the corner had a receipt taped to it dated three days ago. "He painted these windows shut three days before he died." "Maybe he had a fear of break-ins. This area's had a spate of burglaries." "Nobody paints windows shut to stop a break-in, Patel. You'd bar them. You'd get a lock. This is meant to stop something getting out, not in." She moved to the far wall where a mirror hung, its surface clouded with a residue that looked like verdigris, the same green-black bloom she'd seen once on an old brass instrument confiscated three years back, in the last week before Morris disappeared off the face of the earth without so much as a body to bury. She hadn't thought about that patina in a long time. She'd trained herself not to. "Ma'am?" "Get SOCO to swab this mirror. And bag whatever's under the bed, there's something reflecting under there." Patel crouched, reached, came back with a small brass compass, its casing dulled with the same green corrosion, its face etched with markings that weren't numbers. The needle spun, lazy, unbothered by any magnetic north Quinn had ever heard of. "Probably an antique," Patel said, turning it over. "Explains the cash payments, maybe. Bloke was into collecting." "Turn it toward the window." He did, humouring her. The needle swung hard, snapped toward the blacked-out glass and held there, trembling, as if the glass itself were pulling it. "That's not a compass anomaly," Quinn said. "That's not how magnets behave." "Old mechanism. Probably knackered." "Then explain why it's pointing at a wall he painted shut three days ago, and why the salt ring has a gap exactly where that wall meets the floor." Patel didn't have an answer for that. He set the compass down on the table, careful, the way you'd set down something that might bite. Quinn walked the gap in the salt line, heel to toe, and knelt where it met the skirting board. A scorch mark, no bigger than a coin, blackened the plaster, radiating outward in a pattern that reminded her of frost crystallising on a window, except drawn in soot instead of ice. "He wasn't trying to keep something out," she said. "He broke the circle himself. From the inside." "Why would he do that?" "Because whatever he was talking to on the other side of that wall told him to." Patel gave a short laugh, the kind that came out when a man wanted to dismiss something and couldn't quite manage it. "You're saying he opened a door." "I'm saying eighteen years on this job and I've never seen frost on a window in July, or salt laid in a perfect ring by a man supposedly choking on gas that isn't there, or a compass that points at a wall instead of north." She stood, brushing salt from her fingers, though it didn't want to brush off, clinging faintly to her skin like it had a memory of its own. "Bag the compass separately. Not with the rest of the evidence. I want it in my custody by end of day." "Chain of custody's going to ask questions if it's just you handling it." "Let them ask." She looked back at the body once more, at the mouth still open on whatever last word never made it out, and thought of Morris, three years gone, no case file that ever closed properly. "Get me everything on the tenant. Every name he used. And find out what shops on this road buy salt in bulk that doesn't come from a supermarket."