Facing life in prison for murder, a key loyalist makes a surprising confession: he is Agent 6137. When he targeted people for the UDA to assassinate, he was also working for the British. The daughter of one of his victims hunts for the truth about his life as a spy – but as she and Cara dig deeper, they find documents are missing and proof is hard to pin down. 

Archive in this episode: Getty, ITN, BBC

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