The first 3/5 of this book felt like a really great novel. The last 2/5 seemed more like a movie, and I would happily watch that movie!

There were a few things that I thought of while listening to this, that might have made a difference. Spoilers exist beyond this point.

Why not spend one of the final timelines teaching Barry how to build the chair, and then send him back in time instead of Helena? That would have reduced her emotional load and might have made things easier. Barry was also probably behind Helena in scientific knowledge, so giving him a 30 year headstart might have helped Helena out a lot more on the next timeline.

Why, on April 16th, 2019, would you go hiking in the forest, or rowing on a lake, or walking in the desert when you know the fate of the world hangs on your ability to be near the chair and go back in time? Helena knows this, but takes part in these recklessly distant activities, creating this completely avoidable rush to get back to the chair every iteration.

Anyway, the book was outstanding, the narration was great, and I look forward to whatever Blake Crouch puts out next!