I don't know why I disliked this book. Maybe it was the writing style, the disconnected various POVs, or the reveal of the killer so early in the book. I watched the Netflix movie prior to reading the book and that probably also skewed my opinion (although I didn't like to movie either!). 
I think there was a lot more potential here and it fell a little flat. 
Looking forward to giving Perkins other "YA thriller/horror" a read to see if its any better.