Agnes loves her home of Red Creek, its dusty roads, and its God. She cares for her younger siblings and follows the town's strict laws. When Agnes meets Danny, an Outsider boy, she begins to question what is and isn't a sin. Her younger brother, Ezekiel, will die without the insulin she barters for once a month, even though medicine is considered outlawed. Is she a sinner for saving him? But it isn't safe Outside, either: A viral pandemic is burning through the population. In a world where faith, miracles, and cruelty have long been indistinguishable, will Agnes be able to choose between saving her family and saving the world? -- Adapted from jacket.