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 See acast.com/privacy for privacy and opt-out information.