Maciste, for the first time, suddenly discovers to be in love. The object of his love is Ada, the daughter of Thompson, an enlightened industrialist persecuted by Bethel, a competitor without scruples. He first makes use of a small group of agitators in order to foment the workers, then he tries to affect his loved ones, kidnapping his daughter. But he hasn’t squared things up with Maciste. In Maciste innamorato private and politic life interlace and condition each other. Maciste, a new popular hero, acts in advance of his time and sees himself as a media idol: after punishing the instigators, the crowd will recognize him as a movie star and promptly forget their claims carrying him shoulder-high. A hero, though, doomed to an unhappy love.
Young aviatrix Lyda spurns the advances of the Prince of Sèvre and falls in love with journalist Mario, who, although engaged to Cesarina, goes to Lyda's home. Cesarina sees them and manages to persuade Mario to leave Lyda.
Grand Duchy of Wallenstein. Elsa Holbein is the young beautiful daughter of General Julius, the Chief of the General Staff. After a spy named Moise Sthar steals military documents, Julius is accused of betrayal. He kills himself while Elsa is forced to leave. Homeless, she begins wandering the streets until, on the Riviera, she starts her performing career under the pseudonym of Diana Cadouleur and becomes a successful actress and singer. One day, in a small church, she meets an elegant young man and she falls in love with him. But during a tour on the Lucarno Lake she runs into Sthar who, rejected by Elena, spreads rumors about Prince Massimiliano’s behavior.