Only four men commanded Nazi extermination (as opposed to concentration) camps. Franz Stangl was one of the. Gitta Sereny's investigation of this man's mind, & of the influences which shaped him, has become a classic. Stangl commanded Treblinka & was found guilty of co-responsibility for the slaughter there of at least 900, 000 people. Sereny, after weeks of talk with him & months of further research, shows us this man as he saw himself, & 'as he was seen by many others, including his wife. She takes us sharply & deeply into hierarchy of the death camps; the experiences of the very few survivors, both inmates & guards. ' (Observer)