Daniel Bennahmias is one of the few persons in the Sonderkommando at Auschwitz-Birkenau to have survived the war, and the recounting of his experiences reveals details heretofore unknown about the "inner life" of the Nazi factories of death. Bennahmias supplies missing elements in the story of the revolt of the Sonderkommando in Birkenau, the dismantling of the crematoria, the death march and its aftermath, including the miraculous experience of liberation by the Allies.