Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
I went with Connie Willis' Blackout/All Clear , because I really haven't read many books with this setting. (Don't read the first one if you don't have the second on hand - it just stops dead, and the text just continues at the start of All Clear. It would have been maddening if I hadn't had an omnibus edition with both books. They are really one long novel cut into two volumes arbitrarily.)
Blackout and All Clear are a part of Willis' Oxford time travel series, and won the Hugo and Nebula awards. It was OK, though not as good, I thought, as her Doomsday Book.