Interview with Henry Hemming, author of ‘M: Maxwell Knight, MI5’s Greatest Spymaster’

In the run up to the hotly anticipated biography of Maxwell Knight, we caught up with its author Henry Hemming to discuss this enigmatic spymaster. What drew you to write about Maxwell Knight? Initially I was taken by the story of one of Knight’s agents, Olga Gray, but it was my US editor, Clive Priddle,…