Mary lives in a separate world in the forest. No one is ever allowed to leave. Those who do mange to leave simply do not return. Mary has grown up being told that there is nothing beyond that wall. There is no one in the world but them. To go outside the wall will mean death. But Mary knows better. She has hope that they are not the only ones. That there is life beyond the wall. Mary starts to sneek around, going in places she is not allowed to look for answers. She had be warn several times to leave it alone, but Mary would not give up.Mary makes a mistake on leaving her barely-there mother alone and her mom leaves the wall. As soon as she does, her mom is bitten, now changing into a zombie. Mary is blamed and sent to live with the Sisterhood to shape her into a woman. Basically teach her to confine her to what they want. Mary still snoops stumbling onto something she never thought she find.Mary ends up making it out of the wall, and thrown into a whirlwind of an adventure. She learns the truth about the world and ends up discovering a whole new one.Carrie Ryan wrote an divine book. I can't count how many gasps I must of have while reading this. Mary learns some very hard lessons in such a harsh way. I felt for Mary in all the secrets that were kept from her. From her people. She learn that they were kept stupid. No one ever telling them anymore than they should know. This book was greatly written. The plot was nothing that I have read before. This is defiantly a one of the kind story.