Gelsomina’s family works according to some special rules. First of all, Gelsomina, at twelve years of age, is head of the family and her three younger sisters must obey her: sleep when she tells them to and work under her watchful eye. But the world, the outside, mustn’t know anything about their rules, and must be kept away from them. They must learn to disguise themselves.

After growing up in Switzerland, 13-year-old Marta returns to a city in southern Italy with her mother and older sister. Independent and inquisitive, she joins a catechism class at a local church. However, the games and religious pop songs she encounters there do not nearly satisfy her interest in faith. Struggling to find her place, Marta pushes the boundaries of the class, the priest, and the church.