After five years of boarding school at a nuns' school, Soninha, an innocent virgin girl, returns to live with her wealthy family with no moral. Her mother, Malena, has an affair with Betinho, a womanizer and drug addict. Melena invites Soninha and her friend Nanan (secretly in love with Soninha) to spend a weekend in Cabo Frio with her and Betinho. A storm prevents them from leaving the summer house, and Betinho takes advantage of the whole situation to try to sexually abuse the girl.