Moving away from fiction a little(not my area in books);
Nagasaki - The massacre of the innocent and the unknowing by Craig Collie.
Obviously, it's based around the events of the atomic bombings in WW2. Unlike most factual books, it's told from a personal perspective. Collie uses journals, interviews, autobiographies, and all manner of sources(the bibliography was over 30 pages, IIRC) to retell the events from the perspectives of the leaders of the time, the bomber pilots, PoWs in Nagasaki, and Japanese citizens in the cities(One of whom was in both cities as they were bombed).
I couldn't help but be moved by the lives of the various people, and disturbed by some things I learned reading it.