"I had no idea"
One word, 2 letters. WOW! This offering from Blake Crouch and narrated exquistely by Paul Garci, is a winner, and moves to my all time best list.
The plot twists, the choices the characters need to make, the challenges and nuances, are all there, with occasional gore and violence, but nothing gratuitous, at least in my estimation.
Granted, there is some, if not a lot, of belief suspension required to complete the story line, but once you have digested this, the story plot does clarify, and the resolution does promote thought and consideration at the the end.
I recommend this book to fantasy, sci fi and mystery readers most highly.