Caitlyn, a disfigured but graceful and brave young woman, and her father live in a state run by literalistic, controlling fundamentalists. For reasons she does not understand, a variety of people who want her dead or alive are chasing her. Her father tells her to make a run for it. While trying to escape, Caitlin meets up with two traveling companions who have their own reasons for fleeing, and she is aided by a sort of underground railroad. Its leaders believe the fundamentalist government has distorted true Christianity, so they risk everything to help people get Outside to freedom.
Young adult futuristic Christian dystopian science fiction