In this world, when a person of significance dies, a mask is made holding a trace of who they were — their memories, their skill, sometimes their temperament — and locked away for the rare occasion someone needs to borrow a dead expert's knowledge. Someone has stolen the mask of Louis Charbon, a serial killer executed years ago, and put it on. Charbon is loose again, in a sense, wearing a stranger's body and resuming exactly the work he was known for.

Three timelines, one investigation

The book runs three threads at once: Krona Hirvath, the magistrate assigned to recover the mask and stop the killings, in the present; Charbon's own memories, surfacing in fragments that get worse and more coherent as the mask asserts itself; and a third, stranger strand following a girl named Melanie in what reads at first like an unrelated dreamscape. It's a demanding structure, and the payoff for the patience is that by the point the three threads start touching, you understand the magic system, the killer, and the investigator all at a depth a single-perspective book couldn't have managed.

The book asks you to spend time inside a killer's memory to catch him, and never once lets you enjoy the visit.— Prakhar Gautam

Krona is the real center of gravity here, and I appreciated that the book doesn't make her exceptional in the ways this genre usually insists on — she's competent, stubborn, and frequently outmatched by a case that requires her to understand a mind built entirely differently from hers. The horror isn't jump-scare horror; it's the slow accumulation of what the memory-magic system implies about consent, personhood, and what's actually left of you once your skills get filed away for later use by strangers.

This is a bleak book, tonally, and it does not apologize for that or lighten it with much humor. If you need a fantasy with warmth in it, this isn't that. If you want a mystery-structured dark fantasy that treats its magic system as a genuine philosophical problem rather than a toolkit, this delivers on that promise more completely than most books that attempt it.