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Bodies are being found in the outskirts of Boston, their corpses burned beyond recognition, as the police realize a new serial killer is roaming the streets. As the media converges and the pressure is upped, the Boston Police Department must turn to its most brilliant-and controversial-homicide detective: Avery Black. Avery, still trying to pick up the pieces of her own life-her budding relationship with Ramirez, her reconciliation with Rose-suddenly finds herself thrown into the most challenging case of her career. With scant evidence to follow, she must enter the mind of a psychotic killer, try to understand his obsession with fire, and what clues that offers into his personality. Her trail leads her deep into Boston's worst neighborhoods, to confrontations with its worst psychopaths-and finally, to a twist she could never possibly imagine.