John Toland's "Hitler" is the definitive work on the scourge of the 20th century. I read it a while ago; I‘ve never forgotten. Took me the entire summer to read an intensive, beautifully written work. Toland manages to stay objective.If you have any interest in Hitler, WWII– masterpiece.
I bought it on bookbud recently. If chance–sign up for it. You select from genres that interest. They send you a list of about 5 books daily up to 3.99. Fun!