In this crime-thriller, Rome proves to be an unhappy destination for an American couple when the husband is kidnapped and his wife begins a desperate search for him.

Noble, wise King Sardanapolo and his more soft and naive younger brother Prince Sammash get into a bitter feud over the affections of sweet and alluring innocent peasant girl Mirra. Meanwhile, the treacherous and ruthlessly ambitious General Arbace plots against both siblings.

King Minos sacrifices the 'required' virgins to the Minotaur. As his wife lies dying, she confesses that her daughter has a twin she has secreted to avoid giving one of the girls to the Minotaur. The daughter raised by Minos tries to have her twin killed, but failing in her first attempt, continues to try to have her given to the Minotaur. Theseus, the Greek hero, tries to prevent it.