A lean, silver-haired man whose dark frock coat sits so precisely that its seams seem drawn with a ruler. Warm lamplight catches the little worn crescents on his brass buttons and the fine soot caught in the coat's cuffs. His gloved hands fold together at his waist, and his monocle makes one grey eye appear faintly magnified. He walks with a measured, heel-first pace, but when waiting he puts nearly all his weight on the balls of his feet, as if prepared to cross a room before anyone else has decided to move. The unexpected detail: a tiny paper kite, folded from a discarded indictment, is tucked into his breast pocket, its tail carefully repaired with blue thread.

Halberd is controlled but not unfeeling: he can listen to a grieving witness with real patience, then dismiss a frightened clerk for a procedural error without noticing the cruelty in the contrast. In public he is cold, exact, and hard to hurry. Alone with someone he trusts, dry humor and a startlingly gentle concern for small comforts emerge. When angry, he becomes more openly direct and stops hiding behind formal phrases.

Halberd was born above a shuttered brassworks in the crowded lower wards, the son of a furnace tallyman who taught him that a neat record could keep a hungry family from being cheated. As a young clerk he learned court procedure by copying depositions late into the night. The turning point came during the Sluice Court fire: a panicked crowd was blamed for a disaster caused by a city engineer's locked floodgate. Halberd found the engineer's signed order, but his superior ordered him to bury it. He obeyed, and three people were sentenced. Years later, after one of those people died in custody, Halberd began keeping private copies of every case he prosecuted. He rose to Procurador of the Cidade Alta by being exact, tireless, and difficult to intimidate. He still consults retired court stenographer Tessa Sarn, who remembers the fire better than he does, and clashes with Chief Bailiff Varkesh over the use of informants. Now a fresh case appears to implicate a beloved reformer in a bombing, while evidence points toward the same engineering office that caused the old floodgate disaster. Halberd is trying to uncover the truth without alerting the people who can destroy it.