You could argue about whether this book is science fiction, or a case of a "literary" author dabbling in genre from an ironic distance— especially since the main character repeatedly mocks the premise of his story as "sci-fi bullshit," and that premise is time travel— but what matters to me is that this is fantasy being used to do what it can do: make the emotional level of a story literal. Time travel is about bringing stages of life and points of view together that can't meet in reality. There's a man plagued by loss and regret, he badly needs to know things there's no way to know, and a device he doesn't understand allows him to stalk his wife in her past— with sort of good intentions, but this isn't a stable person, and not surprisingly things go wrong.
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