In the summer of 1941, Hitler ruled Europe from the Atlantic to the Black Sea. Britain was struggling to combat the powerful 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. He had access to high-ranking German military secrets and spoke of internal rebellion. His listeners included German soldiers and citizens. American officials and even the President tried to to decipher what it meant for the future of the war. But what these audiences didn't know was that Der Chef was a fiction, a character created by the British propagandist Sefton Delmer, just one player in Delmer's vast counter-propaganda cabaret, a unique weapon in the war. As author Peter Pomerantsev uncovers Delmer's story, he is called into a wartime propaganda effort of his own: the global response to Putin's invasion of Ukraine. This book is the story of Delmer and his modern-day investigator, as they each embark on their own quest to seduce and inspire the passions of supporters and enemies, and to turn the tide of information wars.