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Luther discovers Ripley's corpse and is charged with his murder by Stark and Gray, but whilst in transit the police car is attacked and Luther is rescued by Alice Morgan. After Marwood goes on the rampage at Mary's flat Superintendent Schenk is aware that he killed Ripley and Mary is taken to a hideaway by Stark and Gray, though Gray starts to sense that Strk wants to reel Luther in for a confrontation. Marwood meanwhile abducts the wife of the doctor at the prison where Caitlin's murderer is held and threatens to kill her unless the doctor gives him a lethal injection. Alice and Luther track him down but he escapes, locating Mary via Luther's phone. He kills Stark and wounds Gray but Alice and Luther arrive for a roof-top showdown.