John’s investigation keeps coming up against brick walls - and five decades on, so does Katherine’s. When Kenya admits to a cover-up it begins to make sense. But it’s just the tip of the iceberg. Who exactly were the authorities covering up for, and was the British government involved? As her reporting comes to a close, Katherine celebrates a young woman whose life was cut short; and at the eleventh hour, a chat with a Mi6 agent sheds new light on Julie’s case.

Archive in this episode: ITN via Getty, The Telegraph

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