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 Just finished this book and... here is my review. 
 Like the first one in the trilogy, there are some serious grammatical errors. I've noticed that there is a lot of useless and immature dialogue. Fitting for the characters ages, but not so much worthy of mentioning in the actual book. 
 Another thing I noticed is that it will have entire chapters dedicated to every little thing that happens, and then have a paragraph explaining the next few days. It gets me thinking "What was the point of explaining all that uneventful stuff?" 
 One thing I do like is that, while the book is full of adventure, not much that I don't like has happened (at least so far). In most other novels of this sort *SPOILER* the obvious beginning of this book would be Hayden dying. I love that he lived and I love that so far everything has worked out okay. No one ever writes a story about keeping up a quarantine compound, it's always about the protagonist finding a quarantine, and then that being overrun in a short time from then. I like how this book is more about living in a zombie apocalypse than ending one (or ending in one). 
 I'm not gonna start about the giant cliffhanger endings the author loves so much, everyone else has pretty much expressed their disappointment with that enough for my taste. 
 Overall... skip it. There are better zombie books out there.