Naples of the early twentieth century. A thug keeps a girl completely submissive and, having discovered that she is the daughter of a nobleman, tries to blackmail the father.
The owner of a cheese factory fears communists and mistakes a meek youth who works for him for one of them. He invites him to his house to win his confidence and the youth falls in love with his daughter.
The film is set in Naples. Two doubles, an American and a Neapolitan, alternate visiting Zaza, the maid of a magazine company, deceived by their resemblance.
