Reeling from the death of his friend, Luther races to save the others from Cornelius's terrible retribution. With Luther's increasing absence from the case, Halliday heads the hunt for a killer on the loose - a killer determined to complete his final macabre masterpiece.
Elenco: Idris Elba , Ruth Wilson , Dermot Crowley , Michael Smiley , John Heffernan , Darren Boyd , Patrick Malahide , Laura Haddock , Rose Leslie .