I'm a new poster, but a longtime evesdropper. There are so many different kinds of non-fiction.
I've just finished Lords of Finance by Ahmed, which is the story of the various economies and the central bankers of England, France, Germany, and the US following WW1 leading up to the turmoil of the late 20's. He writes so clearly and concisely he had even me understanding Keynes' economic theories. This is a fairly new book, and of course, he drew parallels to today's problems. Definitely recommend the book to anyone interested in this subject.
In contrast, and also in the non-fiction category, I've recently read Julia Child's My Life in France in which she describes her experiences in France beginning in 1948. One interesting tidbit was that Hemingway's first wife, Hadley, was one of her friends. According to Julia, the Hemingway's son was a member of the OSS during WW2 (I think they called him Mr. Bumby or something like that for a nickname) and was a WW2 hero, aiding American GI's who went down behind enemy lines to safety.
I couldn't recommend this book unless you want to know in great detail what Julia had for lunch 50 or 60 years ago. I know I can't remember what I had for lunch last week. LOL.