When a child prophet foretells the destruction of his people, five children are given new bodies and new lives. For as long as she can remember, 21-year-old Sylvie has embraced her role as the priest's daughter, content to marry her fiancé and lead a quiet, normal life. But between droughts, food shortages, and the slow invasion of her desert homeland, even those modest dreams seem out of reach. Then one sweltering summer day, her best friend Matthew reveals a devastating secret. Sylvie is a Changeling: a fantastical creature given human form and switched with the priest's real daughter 17 years ago. And she's not the only one. Four other Changelings remain hidden in the desert-including Matthew himself.