Although not responsible for the concentration camps, Speer was in charge of the arms produced by the inmates, who were forced into factory work in hellish conditions. Speer set out to tell the story of German armaments in World War II and in his research stumbled across the records of the SS for the period. These included the documents of its chief, Heinrich Himmler, who was determined to infiltrate the war economy with his own people and build an SS industrial empire. Acting with Hitler's consent, Himmler would have made the SS independent of state and party.
The insidiousness of the plot was well known to Speer, one of Himmler's targets However, the breadth of Himmler's machinations, the depth of his ruthlessness, the sheer mania of his last-ditch schemes to increase production became a book in themselves.
Thus Infiltration is the only-book about the SS written by a high-ranking official within the Third Reich. It is also the most telling portrait of Heinrich Himmler ever written.