"The Forest of Hands and Teeth" by Carrie Ryan
Mary knows little about the past and why the world now contains two types of people: those in her village and the undead outside the fence, who prey upon the flesh of the living. The Sisters protect their village and provide for the continuance of the human race. After her mother is bitten and joins the Unconsecrated, Mary is sent to the Sisters to be prepared for marriage to her friend Harry. But then the fences are breached and the life she has known is gone forever. Mary; Harry; Travis, whom Mary loves but who is betrothed to her best friend; her brother and his wife; and an orphaned boy set out into the unknown to search for safety, answers to their questions, and a reason to go on living.
My first foray into zombie literature -- I wasn't sure what to expect especially from a YA novel. Mary is not a very likeable main character because she can't seem to put aside her own desires but perhaps that is her immaturity. She is, after all, just a child. I am hoping she develops and grows in the next book.
P.S. Zombies are way scarier than vampires. And no where near as cute ... unless you are into fetid flesh and missing body parts.