As I read the book, I really enjoyed it. I wanted to find out who the killer was, and I wanted to know about what happened to Lydia, Tessa's best friend. I generally figure out who the killer is and their motive before the end of the book, but this one surprised me. 
 The main thing I wish we got more information about were: (view spoiler)[ 
 (Apologies, this is a bit stream of consciousness because I want to get this down) 
 Lydia. Her journal was mentioned in the end, but we didn't really get to read it. And the fact that the police weren't investigating her for the murder of Tessa's "monster" doesn't make much sense to me. A lot of what went down with Lydia just didn't gel with me. And Lydia throughout Tessa's memories seemed to be a good friend, other than a couple of weird comments (though I guess that was how Tessa was perceiving it, and one of the reason's Lydia's testimony was such a shocking betrayal to her). Not until the end do they talk about how strange she was -- that Tessa was essentially the only one who would talk to her. 
 Charlie. How much did she know about what happened to her mother before she found the court transcripts? And did they ever discuss what Charlie read from Tessa's testimony? Also, I can see why a teenager would want to get to know her mom's best friend's daughter, but the whole situation is a little weird. Aurora is also the daughter of a serial killer who tried to kill Tessa, and Lydia basically betrayed Tessa in every way. I don't believe people should be judged by their parent's actions, but if I was Tessa, I would be really uncomfortable about the friendship. (hide spoiler)] 
 So it gets four stars because I enjoyed it while reading it, but was left with some unanswered questions and feelings of disbelief in the end.