I can't figure out if there has been a recent trend towards books about multiple lifetimes or if I've just been reading more books about multiple lifetimes.
Anyway, Claire North's story of a man who relives the same life over and over again, retaining his memories each time, is fascinating perhaps precisely because she almost immediately moves away from exploring questions of Harry's individual life and jumps into questions of whether one can use this knowledge in the world. I was reminded of both David Mitchell and Kate Atkinson's Life After Life, though North's narrative has more, I think, in common with the former. What this book lacks--thankfully--is Mitchell's occasionally heavy-handed and morose predictions of the future. This is a book, in the best traditions of science fiction, about averting catastrophe and the narrative leaves plenty of big questions--such as the perils of technology, humanity's capacity for self-destruction, the justification for murder to prevent future crimes--implicitly asked, but unanswered. North is here to tell a story; what we do with the story afterwards is up to us.