I wish Goodreads had a half star system, because this was better than a three, but I just couldn't give it four stars.
The book was decently written and moved along at a fair clip, but sometimes I felt like there was too much going on, and the story would lose a little focus. It's a YA novel, with Mary (the protagonist) trying to find her way through life.
Mary has grown up in a medieval like town, with a theocratic-matriarchal-dictatorship where mother church (literally the Sisters) will take care of everything and there are Guardians who help protect the town from a horde of zombies in the surrounding forest. In the middle of the whole strict-theocracy, there's the love/romance/triangle story and then some actual journey action (vs the metaphorical kind it seems like Mary is supposed to be on).
All in all, interesting ideas, decent story, and Go Carrie Ryan for making a zombie book for chicks, because that's not something I've seen a whole lot of.
I will say that my suspension of disbelief was cruelly tortured with the chain link fence.