I bought this book because I'm a sucker for time travel books. I'm a sucker for them, despite the fact that each and every one labors in their own explanation of the grandfather paradox. And I at least like each of them even when they later veer into plot points that clearly create paradox after paradox.

So, that explains why I bought this book, but not why you should read it, even if you don't share my weakness for time travel fiction. That's because this book is more than just an indulgence in the fantasy of "what I would do if I could travel in time".

Sure, part of it is that this particular application of time travel as a concept is a bit different, more about living, dying and starting over right where you started (but whole lives rather than a single day leaves lots of room for the lives to differ instead of Groundhog Day-like repetitiveness). Part of it is that there's an actual plot.

But, and this is maybe more because I read this as I approach the age of 40 instead of the age of 20, there's a soul to this book that explores what it means to contemplate one's life, the nature of friendship and sacrifice, and, without ever actually saying so, what it means to mature. For real.

And, all of the while, it's entertaining.

This is probably the book I've spent the most time ever contemplating a star rating. My rule is to reserve 5 star ratings for books I'd absolutely read again. And, if ever a book invites that question, this'd be it. I'm not sure whether I want to read it again or not. I give 4 star ratings for books I'd recommend unreservedly to other readers. It absolutely meets that criteria and teeters on the edge of wanting to read it again. Make of that what you may.