When his wife goes away to attend her sister's wedding, the young lawyer Fabrizio Marchini expects a quiet time at home. However that evening, a woman bursts into his apartment and demands refuge, claiming that her angry husband Signor Rossi is searching for her. He shelters her when the abrasive Rossi, who rents the apartment above, enters and demands to search the place. Once he is gone, she spends the night in his bed while he sleeps on the sofa. In the morning, however he discovers that both she and his wife's valuable pearl necklace have disappeared. With the assistance of a friend he attempts to track her down before his wife returns.