The son of the wealthy Signor Della Corba loves one of his maids. Her brothers and father rebel at the idea of this union. But the girl is pregnant, and after the birth of the child, Della Corba's son decides to kidnap his mistress on Carnival Day. The brothers, having caught wind of the plan, kill him, then, in disguise, take him masked to his father's house, passing him off as a drunken friend. At dawn, Della Corba discovers her lifeless son under the mask. The maid having died in the meantime, he takes the child in and adopts him.

• Drama