With his friend in peril and a young woman kidnapped by the relentless serial killer, can Luther protect the innocent while preventing Cornelius's violent revenge from consuming him? Who is Luther willing to save, and who can't he bear to lose?

Andrew Mullan, Anthony Howell, Delroy Atkinson, Gary Hailes, Julie Teal, Katie Brayben, Lex Daniel, Michael Obiora, Paul McGann, Roberta Taylor