Golden Globe(r) winner Idris Elba (Pacific Rim, The Wire) returns as brilliantly tormented DCI John Luther for the exhilarating two-part fourth season of the critically acclaimed Luther. Pitted against his most chilling adversary yet, Luther is haunted by past ghosts and hell-bent on revenge as the Serious Crimes Unit faces it's most challenging psychological duel to date. There is no question he will come close to the edge - but will he finally go over?