During the religious celebrations of Saint Agatha in Catania, Vanina investigates a murder committed amid the sacred procession. The case forces her to balance public devotion, superstition, and hidden rivalries, while the threat linked to her father's killer continues to loom over her personal and professional life.

The murder of a young volunteer involved in anti‑drug outreach leads Vanina to uncover a criminal network exploiting vulnerable youths. The investigation exposes painful truths about the past and brings the season's emotional and narrative arcs to a climax. The term carusi refers to young boys, historically exploited as child laborers in Sicily, giving the episode strong symbolic weight.