Billie-Rose's bloodstained body is found in the kitchen of her ground-floor flat. She's been strangled to death, there's a deep laceration to her upper thigh, and a wooden chess-piece grasped tightly in her hand. Daubed on the wall in Billie-Rose's own blood is a strange symbol: a bishop's mitre. All Detective Jack MacIntosh can think is: He's back. Four years earlier, four young women were also strangled to death in their own homes, the same deep wound to the thigh, the same weird symbol scrawled on the wall. The work of the killer they call the Bishop. Is he back to kill again? Jack and his team are in a race against time to pull the pieces together and uncover the truth before more young women die.