In his public life, Dr Winthrop Bell was a Harvard professor and wealthy businessman. But as a secret agent, reporting from Germany in the aftermath of the First World War, he was one of the first to warn of the Nazi plot for racial supremacy that would lead to the Second World War. Speaking to Elinor Evans, Jason Bell discusses this Canadian professor turned spy.

(Ad) Jason Bell is the author of Cracking the Nazi Code: The Untold Story of Canada's Greatest Spy (HarperCollins, 2023). Buy it now from Amazon: https://www.amazon.co.uk/Cracking-Nazi-Code-Canadas-Greatest/dp/1443466743/?tag=bbchistory045-21&ascsubtag=historyextra-social-histboty

The HistoryExtra podcast is produced by the team behind BBC History Magazine.
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