This is a sci-fi book by Catriona Silvey. I enjoyed it, even though it has some very sad bits.
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The book is about two people (Santi and Thora) who keep reincarnating and running into one another and various other people (plus one cat and a parakeet). In time, they begin to remember their other lives and must try to figure out why they keep coming back to one particular city and to one another. It’s a thought-provoking book that will keep you guessing until the end. I think it would make a great movie.