Investigating evidence of a violent struggle at the home of Ministry of Defense member Dudley Kynaston, Pitt and the Special Branch discover the brutally murdered body of a young woman before realizing that Kynaston is not who he appears to be.

When the bodies of two high-profile women are discovered, bearing signs of rape, and an innocent man is accused of the crime, Thomas Pitt's quest for the truth forces him to play a dangerous game of international politics and murder.

Special Branch officer Thomas Pitt, hastening to rendezvous with a secret informant, arrives a second too late, preceded by a knife-wielding assassin. As he pursues the killer and the information he needs to stop a devastating plot against the British government, his clever wife Charlotte heads to Dublin to investigate a case involving Pitt's supervisor, Victor Narraway.

In England, detective Phil Benholme experiences a policeman's worst nightmare: his son becomes a suspect in the murder of a professor. The case involves drugs.