When Mario is granted bail, his case is entrusted to an eccentric prince of the forum, talkative and extravagant. A friend of Mario's, met in prison, realizes that it could be a case of the same name and sets out to travel all over Rome in search of Isolina's real husband. When he finds him, he manages to drag him to court where, in the meantime, Mario - following the advice of his defender - has pleaded guilty. Thus the court, while recognizing him innocent of the charge of bigamy, condemns him for self-malignancy; and Isolina, who, complicated by her condition as an elderly single girl, had exploited the circumstance to try to frame a handsome man, is in turn condemned for perjury. Having served the small sentence inflicted on him, Mario can finally return to the arms of his family, who are waiting for him at the exit of the prison.
