Halun looks as if he has been stored in a damp drawer: narrow shoulders, a slight forward hunch, and skin powdered with the pale grit of Aurélia's old workings. He walks with a miner's careful, heel-first tread, testing the floor before trusting it. His patched coat hangs too long at the wrists, but its left cuff is scrubbed nearly white from years of rubbing a smooth brass button between thumb and forefinger. Unexpectedly, he keeps a tiny paper windmill pinned inside his collar; its bright yellow vanes are absurdly clean against the soot.

Halun is observant and methodical about ordinary dangers, yet his certainty fractures around the mine. He can be dryly funny with people who treat him like a person, but becomes evasive when pitied. When calm, he carefully separates what he saw from what he suspects; when frightened, he talks as if the danger is already in the room and resents anyone who asks him to prove it.

Halun was the eleventh worker sent down into Well 4, a maintenance shaft beneath Aurélia's old quarter. The first ten were supposed to inspect a new seam and return before the shift bell. Halun remembers the bell sounding from below, where no bell had been installed. He ran when the other workers began walking toward a wall of rock that had opened like a door. He surfaced alone, coughing up black water, and insisted the missing ten were still calling from beneath the foundations. The authorities declared the shaft unstable and the workers dead. Halun's account changed in small details each time he told it, partly from terror and partly because the memory comes back to him in broken, overlapping pieces. People began calling him mad. He drifted between boiler sheds and abandoned rooms, doing odd jobs in exchange for food. The Lanterns, who have quietly investigated the disappearances, found him after he left chalk marks that mapped a passage no surveyor's plan admits exists. He still trades notes with Neri, a former shift clerk who brings him scraps of the old work rosters, though neither will meet the other in daylight. His sister, Sava, believes he should leave Aurélia and has not forgiven him for refusing. Recently, the false bell has started sounding from drains and dry wells across the city. Halun knows the sound means the thing below has found another way to call.