Other reviews are right in praising the audiobook. Engaging narrator. I found myself hooked by the story for at least the first half as we learned more about Joe, Carl, their scars, and an intense atmosphere of uncertainty and suspicion. 
 Then a lot of physical action was forced into the ending. It came across as contrived and didn't fit with the psychological focus of the first two-thirds of the book. The contrived climax almost reduced this by a star for me.