The Rise and Fall of the Third Reich
I read most of the book after you suggested it a few years ago. World history wasn't taught in my high school, and I didn't study it in college, so the details of Hitler's rise to power was something I needed.
I recently learned about Molotov–Ribbentrop Pact which shed a different light on WWII. I also read about the war between Russia and Japan over Mongolia and parts of Siberia in '38. If you could think of a few more books that would that would bridge the crevasses in my knowledge of history, I'd appreciate it.