In August 1945 Great Britain, France, the USSR, and the United States established a tribunal at Nuremberg to try military and civilian leaders of the Nazi regime. G. M. Gilbert, the prison psychologist, had an unrivaled firsthand opportunity to watch and question the Nazi war criminals. With scientific dispassion he encouraged Goering, Speer, Hess, Ribbentrop, Frank, Jodl, Keitel, Streicher, and the others to reveal their innermost thoughts. In the process Gilbert exposed what motivated them to create the distorted Aryan utopia and the nightmarish worlds of Auschwitz, Dachau, and Buchenwald....