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Teresa (Ana Belen) is an aristocrat's daughter and doesn't give a fig for the lives of mere servants. However, she is erotically drawn to one of her servant's sons, and that is not something she will ever ignore. On the night of a party celebrating her betrothal to another aristocrat, she lures the boy into her room and indulges in frenzied lovemaking with him. In the hubbub and confusion, he hits his head on a bedpost and dies. She entices yet another into her room and induces him to help her get the boy's body to the lake, whereupon she kills her helper and returns to the party looking like the cat that swallowed the canary.