I love the way Courtney Summers writes, mainly because her MC's are not sweet and innocent, they aren't perfect girls who fall in love with bad boys. They are usually bitchy messed up girls who do terrible things, screw people over and make themselves even more miserable...sounds about right. 
 If you are expecting a zombie book, you may be disappointed. This was a book about people, with zombies. I'm not complaining, I do like zombie fiction, however I could tell that although the setting was crucial it still wasn't the biggest part of the book. What you have is a bunch of scared teenagers trapped in a situation that is completely out of their control...and you get to see the results.