In the summer of 1941, Hitler ruled Europe from the Atlantic to the Black Sea. Britain was struggling to combat the Nazi propaganda machine, which crowed victory and smeared its enemies. But inside Germany, there was one notable voice of dissent from the very heart of the military machine: Der Chef, a German whose radio broadcasts skilfully questioned Nazi doctrine. But what audiences didn’t know was that Der Chef was a fiction, a character created by the British propagandist Sefton Delmer. This is the incredible true story of the complex and largely overlooked significance of Delmer’s role.