Anne-Marie Duff reads the incredible true story of Ursula Kuczynski: lover, mother, soldier, spy. From acclaimed historian, Ben Macintyre.

Abridged by Richard Hamilton
Produced by Emma Harding

Episode 5: In a quiet English village in 1942, no one knows that their neighbour and mother-of-three, Mrs Burton, is really Ursula Kuczynski - a dedicated communist, a colonel in Russia's Red Army, and a highly-trained spy. Nor do they know that 'Agent Sonya' is currently helping the Soviet Union to build the atom bomb.

Opening music: Kühle Wampe oder Wem gehört die Welt? Solidaritätslied by Hanns Eisler from album Bye-Bye Berlin, performed by Quatuor Manfred, Harmonia Mundi
Closing music: Suite No 2 Op 2 Niemandsland i by Hanns Eisler from album Roaring Eisler, performed by H K Gruber and Modern Ensemble, RCA Red Seal Show less