** spoiler alert ** 
 What an engaging read! I'd heard that I wouldn't want to put it down toward the end, and that was right! And I was still surprised by Olivia's turning, even though the hints were there and it made sense. Also, I'm kinda sad about Jack, even though he was jack... (Lol). 
 Gave it 4 stars because it did take me a little bit to get into it. But, man, as soon as I was done I ordered Linger, and I can't wait to read it!