Cal Drake has left the police force and is now working as a private detective, having teamed up with the motorcycle-riding Dr Rayhana Crane. The chilling discovery of a severed head on the Tube draws Calil Drake back to the case he failed to solve four years ago which left his police career in tatters. Crane and Drake investigate while also searching for Howeida Almanara – a young international student from the Gulf and the missing girlfriend of a Crane family friend. Could her disappearance be linked to Cal’s past and the gruesome discovery on the Tube? Crane and Drake are plunged into the dark underworld of London and international crime, and must risk their lives to find answers.