When her grandmother dies, Nour finds a hidden box: an old photo of a white village, a strange amulet, and a letter with one warning: "If they call you, don't go back." The village is called Ain Sawda. It isn't on any map. It hasn't existed since 1961. Then, at 3am, her phone rings. A number from Tunisia. And a voice humming her grandmother's lullaby.