Mary lives inside a fenced off village from The Forest of Hands and Teeth. On the outside of her village are what they call the unconsecrated (zombies). The world has been over run and they believe that they are the last village standing. That is until Gabrielle arrives and throws her world upside down making her question the life that she's always known. Eventually the walls are breached (because what would a zombie book be without a breach) and they must escape into the first of the unknown. She's always dreamed of seeing the ocean and this is finally her chance. 
 Below goes more in depth with story so semi-spoilers.... 
 I really enjoyed the plot to this book. Completely different twist on your usual zombie novel for sure. What I didn't like though was the main character. She was selfish beyond all means despite everyone fighting for her love and affection. I mean poor Travis you guys this whole book he's practically suffering. I also don't understand why they didn't go TWD on their ass. Like, "Oh man there's a unconsecrated right in front of me about to eat me! But that's a human (or was) and I can't kill that person." Hell no. If it's life or death you take advantage and kill them all. Like for example when they were in the tree houses and had that long spear she just moved the unconsecrated around with instead of stabbing each in the head. I mean you guys were locked up there for months. No escape plan? Nothing? Just playing dress up all day long and writing love notes? 
 I just wish the female character would've been more of a badass. Specially since the book is written by a female. She had her one badass moment in the treehouse fending for Travis but that was about it. The rest of the story she was whining about Travis vs. Harry (I'm team Harry), finding the ocean (despite knowing it's infested as well), and just an all around not girl-power character. 
 The plot was what kept me so intrigued not the main character Mary.