3.5 from me, but rounding up because in general, this is the type of book that people will talk about and debate about and have a ton of fun discussing. I love a good time travel book and this one has a plot that keeps you turning pages and characters I enjoyed. The "science" (and obviously I'm using that word liberally) fell off a bit for me, which took me out of the story a bit, but that could be my own preference for writers like Blake Crouch and Andy Weir who some say give us too much science background. All in all, this is a fun thriller I think most people will enjoy. And props for a great title and a fabulous last line.

Thanks to NetGalley and the publisher for the ARC!