An extraordinary and unique document: Hoess was in charge of the huge extermination camp in Poland where the Nazis murdered some three million Jews, from the time of its creation (he was responsible for building it) in 1940 until late in 1943, by which time the mass exterminations were half completed. Before this he had worked in other concentration camps, and afterwards he was at the Inspectorate in Berlin. He thus knew more, both at first-hand and as an administrator, about Nazi Germany's greatest crime than did any save two or three other men.

Taken prisoner by the British, he was...