In 1945, after his capture at the end of the Second World War, Hermann G ring arrived at an American-run detention center in war-torn Luxembourg, accompanied by sixteen suitcases and a red hatbox. The suitcases contained all manner of paraphernalia: medals, gems, two cigar cutters, silk underwear, a hot water bottle, and the equivalent of 1 million in cash. Hidden in a coffee can, a set of brass vials housed glass capsules containing a clear liquid and a white precipitate: potassium cyanide. Joining G ring in the detention center were the elite of the captured Nazi regime--Grand Admiral D nitz; armed forces commander Wilhelm Keitel and his deputy Alfred Jodl; the mentally unstable Robert Ley; the suicidal Hans Frank; the pornographic propagandist Julius Streicher--fifty-two senior Nazis in all, of whom the dominant figure was G ring. To ensure that the villainous captives were fit for trial at Nuremberg, the US army sent an ambitious army psychiatrist, Captain Douglas M. Kelley, to supervise their mental well-being during their detention. Kelley realized he was being offered the professional opportunity of a lifetime: to discover a distinguishing trait among these arch-criminals that would mark them as psychologically different from the rest of humanity. So began a remarkable relationship between Kelley and his captors, told here for the first time with unique access to Kelley's long-hidden papers and medical records. Kelley's was a hazardous quest, dangerous because against all his expectations he began to appreciate and understand some of the Nazi captives, none more so than the former Reichsmarshall, Hermann G ring. Evil had its charms.