I just finished Night Witches by Bruce Myles, which was pretty good. Mo doesn't usually like my kind of books, but I think she'll like that one. Sort of an aerial combat chic flick. It would make a good movie.
Then by accident I spotted The Great Influenza on a bookshelf, by John Barry. Thought we'd lost it. I'll read that again. It's about the great 1918 flu, but has a much wider scope, a lot of background about the history of science and medicine starting centuries B.C.
Barry wrote the wonderful Rising Tide, required reading for anyone who lives near the Mississippi River.