Private goes on the hunt for London's most feared killer since Jack the Ripper. In London, young women are being abducted and their bodies found mutilated in a grotesque, mysterious way. Carter's ex-wife, DI Kirsty Webb, leads the investigation into these brutal murders, which may somehow be linked to Hannah Shapiro. Working together, the two investigators are caught in a desperate race against the odds. Private may be the most advanced detection agency in the world...but can they catch a predator who rivals London's most elusive killer ever?