Pitted against his most chilling adversary yet, Luther is haunted by past ghosts and hellbent on revenge as the Serious Crime Unit faces its most challenging psychological duel to date. There is no question he will come close to the edge, but will he finally go over?

It follows Detective Sergeant Nancy Devlin, who leads a double life. Her high-flying police career is at odds with an attachment to shady businessman and drug trafficker Frank Le Saux, who acts as a father figure to her. Having kept him off the police's radar for years, Nancy finds her secret at risk of exposure when Frank is murdered in Brighton and she's placed in the middle of the investigation, with a killer stalking her. Detective Sergeant Nancy...