Fire Watch, by Connie Willis

Award judges at times like to reward a story that relies mostly on its emotional strength rather than the speculative imagination, and that would be where they went with Fire Watch. It's a time travel story, but there's only a smattering of talk of grandfather paradoxes or whatever. It's mostly the struggles of a history student sent back in time to experience the saving of St. Paul's Cathedral during the Blitz. It's post Cold-War-Turned-Hot, which makes it feel dated, but that's OK. For me, it never quite got a grip. It depended a lot on the reader's independent feelings about the cathedral, and I can't say I'm familiar with it. But if you want to read it, do it soon, as Infinity Plus has been dormant for awhile.