Castley Cresswell is sixteen. She lives with her three brothers and two sisters in a big house in the woods. Her mom doesn't speak and her dad keeps telling her that God hates the world. Castley can't bring herself to hate the world. She likes the woods, for one thing. School can be fun, sometimes. And then there's boys. God definitely hates fun and boys. Castley loves her brothers and sisters, too. Even if they annoy her. Even if they are scared to death of Father. Even if they're too scared to run. Father wants Castley and her siblings to stay in the family forever. And he'll do whatever it takes to keep them there, even if it means the Cresswell kids never get to grow up at all. What if survival means Castley must leave her brothers and sisters behind?