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Still reeling from the death of Justin Ripley, Luther is arrested. An old friend comes to his rescue, but can Luther track down and confront the vigilante before he can take another life?
Luther and Ripley go after a serial killer who is targeting criminal offenders, and who decides to invite the public to determine the fate of a paedophile. Stark and Gray go after Luther through Mary.
Luther has to juggle two investigations as he tries to stop a copycat serial killer who is murdering women in the manner of an unsolved case from the 1980s, and establish which of many suspects might have murdered a man who used the internet to torment his victims. Unknown to Luther, his every move is being watched by officers from the anti-corruption unit, who are determined to expose him.moreless
Luther tasks Ripley with leading the investigation into Cass's murder, while he re-examines cold-case files in an attempt to predict the serial killer's next move. Det Supt Stark increases the pressure on Ripley to turn on Luther.