A couple of time travellers are stuck in victorian times trying to correct a flaw in history and the space-time continuum, apparently caused by an object being mistakenly brought forward in time.

To Say Nothing of the Dog is a funny and engaging story, which references a number of other books, not least among these [b:Three Men in a Boat|4921|Three Men in a Boat (Penguin Popular Classics)|Jerome K. Jerome|http://photo.goodreads.com/books/1165515911s/4921.jpg|4476508], but also the mysteries of [a:Dorothy L. Sayers|8734|Dorothy L. Sayers|http://photo.goodreads.com/authors/1206564934p2/8734.jpg] and [a:Agatha Christie|123715|Agatha Christie|http://photo.goodreads.com/authors/1190633574p2/123715.jpg]