Sicily, 17th Century. When his fiancée is kidnapped, a young man sets out to find her.
The film takes place at the end of the 19th century. The Cardinal Guglielmo Massaia has spent 20 years in Ethiopia to convert people to the Catholic Church. He comes back to Italy and he tries to get the help of the government of Piedmont. The Count Cavour, although he appreciates the Cardinal's deeds in Africa, cannot grant his Cabinet's support to the Cardinal's plans. The missionary man, trusting the Divine Providence, goes back to Africa by himself. The Cardinal, who is known among the people as Abuna Messias, becomes a friend of king Menelik. The support of the king is fundamental to spread his word and accomplish his mission. The Head of the Coptic Church, Abuna Attanasio, does whatever he can to prevent Massaia from reaching his goals and to get him exiled from Ethiopia. Menelik refuses to help Abuna Attanasio, who decides to address the Emperor, thus igniting a war between the Emperor and his subject Menelik. In order to end the war, the Cardinal decides to leave Africa.
When young Adriana gives birth to her daughter, she understands that her baby's father won't come back to her; he is, in fact, a playboy, Diego. Years pass by and Adriana is now happy with her new job in a hair salon but, when one day Diego comes in the salon, he sees Adriana and he tries to speak with her but she tries to hide herself. He visits her another night but she refuses him; in the meantime, a colleague of Adriana, the accountant Mario Fabbrini.....
During a reception in a villa, wealthy banker Calandri is killed in the park with a gunshot. The gamekeeper Barra is immediately arrested, but he declares himself innocent. During the trial it turns out that the defendant had threatened the victim, guilty of courting his sister-in-law. But the deposition of a journalist present at the party soon leads to discover the existence of a dense network of equivocal relations between the victim, the guests and the servants. This judicial setting drama is allegedly the second Italian sound film after "The Song of Love", made using the RCA Photophone recording technique, and is also considered to be the first Italian detective film, a precursor to the later genre of Giallo films.
A young girl is abducted by her tutor, and they set off in a ship which has a sheik on board, who tries to molest her, but she is saved by a sailor. He and Maciste fight off the entire crew but the girl is captured again by the sheik and carried off to his harem, where Maciste and the sailor rescue her and take her back to Italy.
Maciste takes advantage again of a break of acting in order to wash away injustice and castigate the wicked, this time in the name of dynastic legitimacy. Otis, the prince of Sirdagna kingdom, lives undercover in a foreign land, waiting to ascend the throne; Stanos the evil ruler though, is willing to do anything in order to prevent the legitimate prince installation. The court is a dangerous place, Otis is young and naïf: in order to solve the situation, Maciste, following the advice of his friend Saetta, temporarily takes Otis’s place, and presents himself as the legitimate prince. The crowd, enamored by his good looks, applauds him immediately as the emperor.