The Only One Left

*2.5 stars This started out compulsively readable and had a setting and trope I enjoy, so I was quickly in and thought it would coast easily to at least a 3.5-star rating and maybe a 4. But the book comes off the rails in the later half with too many twists to even stay invested and a closing act that I was just annoyed by. Sager writes good popcorn novels, but you have to find that sweet spot with twists and their plausibility to avoid too many suspensions of disbelief or you end up just not caring.