Luther returns to work after a traumatic arrest to investigate the murder of a former child genius's parents, and quickly deduces that their daughter is responsible. However, unable to find evidence to convict, he becomes embroiled in a battle of wits with the suspect - who has set her sights on him and his estranged wife.
Elenco: Idris Elba , Ruth Wilson , Dermot Crowley , Michael Smiley , John Heffernan , Darren Boyd , Patrick Malahide , Laura Haddock , Rose Leslie .