Historia de la Gestapo by Jacques Delarue is a seminal 1962 historical account chronicling the rise, mechanics, and collapse of the Nazi secret police, based on the author's work with post-war investigations. The text highlights how the institution transformed from the Prussian police into an SS-controlled tool of terror, focusing on internal power struggles and the "banality of evil" exhibited by its members. You can find more information about this work on Lecturalia . The Gestapo: History of Horror - Google Books