As too often happens the sequels don't live up to the first book. Sadly, this is the case also with this series. What made me read on was my desire to find out whether or not Evan survived. This book feels very much like an in-between book that doesn't really contribute much to the story line. It emphasis the uncertainty all the characters feel and gives hints to the final solution/ battle/ clarification as well as give us a look into the character of Ringer. Unfortunately for me I never really liked her, which made this book pretty boring for me. Still, it has some good parts and some interesting quotes/ dialogs (like this one, which was just beautifully written). 
 Yancey is a good writer but, at least in my opinion, he could calm down on the contrasting sentences ("It was simple. It was complex."). I get that it's a literary device to show that "It's an either/or world." and most of the time it sounds really good! Unfortunately it appeared too often for me to fully enjoy it (too much "It was the best of times, it was the worst of times" sounding). 
 I still enjoy Bear. Cassie makes him sound so careless and sassy! 
 "That's the cost. That's the price. Get ready, because when you crush the humanity out of humans, you're left with humans with no humanity. In other words, you get what you pay for, motherfucker"