Ernst Hanfstaengl was court jester, pianist, and foreign press chief for Hitler, he even claimed to have devised the chant of Sieg Heil, but when the two men fell out he fled to Britain, where he was interned and transferred to America. There he worked as the star of Roosevelt's 'S-Project,' informing on 400 leading Nazis and creating a detailed psychological portrait of Hitler. Through newly declassified documents, interviews with surviving family members and original writing by Hanfstaengl himself, Peter Conradi recounts a remarkable life.