She was a top Soviet spy and a colonel in the Red Army, who had plotted to kill Hitler and sent secrets from the British atomic bomb programme to Stalin. So how did Agent Sonya - or Mrs Burton to her neighbours - evade MI5 for so long?
Guests:
Ben Macintyre, associate editor and columnist, The Times, and author of Agent Sonya: Lover, Mother, Soldier, Spy.
Rosa Ellis, interactive journalist, The Times and The Sunday Times.
Host: David Aaronovitch.
"Merfolk Music Box" by Komiku is licensed under CC0 1.0 (looped from original)
"Melancholic Ending" by Soft and Furious is licensed under CC0 1.0
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