The hunter has become the prey! The headless corpses of three men are found in a London side street. Their mutilated torsos are witness to an unspeakably agonizing death. It becomes chillingly clear that this discovery is a horrific message to the Metropolitan Police - and to one officer in particular. DI Stacey Collins finds herself on the hunt for a psychopathic killer. But it would seem that this is no ordinary homicide! All the victims had themselves been predators, terrorizing the innocent. Is this a twisted vigilante mission, or something far more sinister? Meanwhile, Collins must battle her own demons as the MET's Internal Affairs department investigate her past and her connections to London's underworld. Collins faces her toughest challenge yet - torn between justice and revenge.