Just finished Connie Willis' Blackout/All Clear, a story set in WW2 London, around some historians from 2060 that travel back to that era. Overall, I liked the story (though a bit too much melodramatic at times); however, I was not impressed with the time-travelling aspect at all. As if the writer didn't really think it through; in particular, I don't like when the 'the universe doesn't care about you' is broken without some kind of explanation. Anyway, the books have won many awards, so I may hold a minority opinion here...