Dancecostume eccentric, romantic of don Perlimplin, never knew women, falls in love with BelISA. He proposes to her she agrees. But on the first day of their marriage or BelISA is cheating on her husband with young Cavaliers, succumbing to the charms of the midnight Serenade. In perlimplin finds out about the betrayal. And decides to play with his wife a cruel joke. He begins to care for her incognito. BelISA falls in love with a stranger, forgetting everything and everyone, but in that moment, when finally the stranger Perlimplin opens her face, he stabs himself.