Documentary going behind-the-scenes at The Clink, a restaurant staffed by criminals.
Luther has a copycat killer on the loose, a body to hide and a suspicious Baba to appease.
Luther must outmanoeuvre a man whose brutal and escalating murders seem to have no motive.
Luther must save Ripley's life in time to stop Cameron's final murderous set piece.
Luther faces a surreal and nightmarish case of a man who murders wearing a Punch mask.