Let's start by saying - I could not put this book down, and finished reading it in an evening.
Great "post-apocalyptic" novel. I hate to categorize it as zombie genre, because it kind of falls outside of that. There are aliens, monsters, mutations. There is a heroine that isn't too annoying (sometimes hard to find), and a hero who isn't overbearing.
I did like how the book switched from character to character, giving you different points of view through out the book. It was a nice change and gave you insight into several of the main characters.
This book will scare you, will break your heart, will cause you to tense up. And like me, I don't think you will be able to put it down once you start reading it.
I do recommend it for those who like the zombie books, or good sci fi, or just enjoy a good story, period.