Helen Duncan was a famous medium who travelled around Britain in the 1940s performing séances. She claimed to speak to the dead, and even produce physical manifestations of their spirits. But when she seemed to know wartime secrets about the whereabouts of military ships, she caught the attention of MI5. And in 1944, a few months before D-day, she was convicted under a 200-year-old "Witchcraft Act".
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Artwork by Julienne Alexander.