The perfidious brother of the deceased Duke of Lusitania usurps the throne from its legitimate heir, the Grand Duchess; however, an enigmatic man in black known only as the Zorro is out for justice. But, who is this valiant vindicator?

In the study of a lawyer, two young spouses tell their story. The singer Tony manages to reach the much coveted success, and can thus marry his girlfriend. But a clause in his record contract obliges him to remain a bachelor for two years.