3.5* 
 My gut reaction was to rate this a four, but the more I think about it the more I want to rate it a three. That being said, this book is making me think so I think I'll keep the current rating as is and have there be an asterisk. 
 Some superficial comments: I listened to the audiobook of this while on my trip to NYC, and I really enjoyed the voices. This is definitely a character-over-plot kind of book, which I like, but at times the pacing was annoyingly slow. The author should have really cut out some of the long scenes that really didn't accomplish anything for the character growth or the plot; these scenes made me detach from the book, which is sad because initially I was so invested in the characters. And I also didn't enjoy the the feeling that scenes were unrealistically contrived to get certain drama. 
 This is a neat book about a 2/3 chance of an apocalypse