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Photographs: Michal Vitásek, David Flint, Corbis, Paul Letters.

Special thanks to Zdeněk Špitálník of Prague’s Military History Institute for his expert help. 

For more on my novel, set in Poland, Prague, Paris and London, 1939-42, see  aChanceKill.com 

Follow the A Chance Kill Facebook page or Follow @LettersPaul me – and I also run a second Twitter feed On This Day In History 75 years ago