Ziba Mackenzie profiles killers. Now one is profiling her. Rush hour, London. A packed commuter train is torn apart in a collision. Picking through the carnage, ex-special forces profiler Ziba MacKenzie helps a dying woman who passes on a cryptic message: He did it. You have to tell someone. When a corpse is found bearing the gruesome signature of a serial killer dormant for twenty-five years, Ziba is pulled into the hunt for the perpetrator. As the body count rises it becomes clear he’s on a new spree. But what’s brought the London Lacerator back after such a long hiatus? And does his sudden return have anything to do with the woman on the train? Ziba scrambles to profile the killer in the hope of predicting his next move. But time is running out. And the closer she gets to uncovering his identity, the closer he gets to destroying hers.