The Portland Spy Ring was one of the most notorious of the Cold War, stealing top secret information about Britain’s nuclear submarine technology for the Soviets.

Right at the heart of this spy ring was an extraordinary love affair between its two British members, Harry Houghton and Ethel Gee.

But is love – as Ethel always claimed – a strong enough motivation to betray your country?

A BBC Reel production in collaboration with the National Archives.
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