To Say Nothing of the Dog by Connie Willis is either a quiet, gentle science fiction book with a bit of a mystery (a missing Bishop’s bird stump), or it’s a cozy, humorous mystery with a bit of science fiction (time travel).
The search for the missing bird stump involves several intrepid time travelers, Ned and Verity especially – three men in a boat, to say nothing of the dog – a cat that has time traveled – Wilkie Collins book, The Moonstone – Agatha Christie’s Piorot – Lord Peter Whimsey – Sir Arthur Conan Doyle – spiritualism – jumble sales – two great butlers – the Magna Carta – the Battle of Waterloo – the bombing of London and most important of all (as all science fiction lovers, or Back to the Future fans know) – the space-time continium!.
Oh yes, and it is also several love stories. ( 
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booksmoviesandgames 
You had me at “Poirot!”