2 Stars. 
 I was really excited to read this book. A sci-fi thriller that promised a twisty ending. I was disappointed. The premise was fantastic!! And it was a fast read if you forced yourself to get through pages 30-150. The book just didn't work for me. 
 The first 150 pages was character building, but in a really poor way, trying to set the scene. When in reality, the end of the book treated the characters as total strangers. None of their behaviors or personalities played a role in anything. At all. 
 There was really no reason why this book was YA except the main characters were 16-17. But there was really no reason for them to be teenagers. That part was never explained. There were some instances where creepy situations were described perfectly, but the in between falls flat. The last 100 pages were fast-paced and the ending was a surprise which I appreciated. 
 This book seemed written in a rush to appeal to teenagers, when it could have been a really successful adult fiction book that left out the teenage angst and nuances and relied on sci-fi thrill alone, maybe replacing the dull parts with actually meaningful characters. 
 B+ for new ideas. F for jumping on the YA train.