To Say Nothing of the Dog (1998)
A humorous trip into an unpredictable world of intrigue, love, and time travel from Connie Willis, winner of many Hugo and Nebula Awards. ..
Ned Henry is in desperate need of a break. He’s been hopping between the twenty-first century and the 1940s in quest of the bishop’s bird stump, a Victorian atrocity. It’s part of an effort to rebuild Coventry Cathedral, which was destroyed in a Nazi air assault almost a century ago.
However, Verity Kindle, a fellow time traveler, unwittingly takes something from the past back into the present. Now Ned must travel back in time to assist Verity in putting things right—not only to save the experiment, but also to avoid altering history itself.