Picked this up because of the viral tweet about it. It's so short that I felt like I was just getting used to the style by the time it was wrapping up, but I really liked the time travel mechanics and hints at world building. It's also one of the more successful co-authored books I've read. Those tend to feel pretty disjointed to me (Good Omens in particular), but this solves that by having each author write one of the characters.