This is my 2nd book by this author and I’d give it a little higher rating than my last one. It was intense, and definitely had me on the edge of my seat wondering what exactly was going on, who was this killer that was part of the tagline on the cover. It started out with an event that was so emotional and definitely influenced how Katie behaved or acted. Not to mention that Aster had her own issues from how she had behaved or reacted to that event at the beginning. There were portions split out from the viewpoint of someone you didn’t know for sure. Was it one of the two girls after the story we were getting on their hike? Was it another person they’d seen along the trail? Was it even anyone we’d had any contact with through Aster and Katie’s viewpoints? Then, who was the character that Katie and Aster should be worried about. Was it Finn? Was it the runner they’d seen early on? The two climbers? The druggie guy? I had guesses, some panned out, some weren’t quite right, but I liked the way the author kept me turning pages just to find out what happened.