God this book was fun. While I called the perpetrator almost immediately, I still really enjoyed it. It also felt realistic as far as YA thrillers go - well-rationalized as to why the cops aren't being involved, characters' actions make sense, etc. The audio made it feel extra intense, just because of how much emotion the narrator put into it. The ending was a little weird, but I still bought it. So far I've been reading her books in reverse publication order and they just keep getting better and better. Love me some Diana Urban.