A gunman begins murdering uniformed police officers, prompting the detective to taunt the killer on TV in the hope of inspiring him to turn his anger on him and come out into the open. To his horror, Luther also learns that Alice Morgan has been investigating his past - and is threatening to tell Zoe what she has discovered.
Elenco: Idris Elba , Ruth Wilson , Dermot Crowley , Michael Smiley , John Heffernan , Darren Boyd , Patrick Malahide , Laura Haddock , Rose Leslie .