I found a couple on my bookcase that I had forgotten about. Unfortunately, they aren't available as ebooks. "SS-GB" by Len Deighton, and "Resurrection Day" by Brendan DuBois. Both are excellent. "SS-GB" is about Nazi occupied Britain, and "Resurrection Day" about the 1962 Cuban missile crisis that results in a nuclear war.
It really irritates my wife when I "help" her with the spring cleaning, and she finds me sitting in the hallway leafing through a pile of books.