This exploration of the private wartime diary of Alfred Rosenberg--Hitler's 'chief philosopher' and architect of Nazi ideology--interweaves the story of its recent discovery with the revelation of its never-before-published contents, which are contextualized by the authors: The result is a unprecedented, page-turning narrative of the Nazi rise to power, the Holocaust, and Hitler's post-invasion plans for Russia. A groundbreaking historical contribution, The Devil's Diary is a chilling window into the mind of Adolf Hitler's 'chief social philosopher, ' Alfred Rosenberg, who formulated some of the guiding principles behind the Third Reich's genocidal crusade. It also chronicles the thrilling detective hunt for the diary, which disappeared after the Nuremburg Trials and remained lost for almost three quarters of a century, until Robert Wittman, a former FBI special agent who founded the Bureau's Art Crimes Team, played an important role and tells his story now for the first time.