Adopted together after a tough childhood in an orphanage, Nica and Rigel realize that unexpected but irresistible feelings pull them together.

On a tropical island, doctors are trying to eradicate malaria, a disease that is causing numerous deaths. Two of them are in love with the same woman, Virginia, a doctor. One of them, Pietro Fischer, had previously been engaged to her, but was implicated in a murder, though innocent. Having fled to avoid prison, he is tried and convicted in absentia. Years later, he returns under the alias of Dos Passos, gaining a reputation as a talented scientist.

1017 AD. The Republic of Pisa is organizing a fleet to drive out the Saracens who are infesting the Mediterranean. While the forces are away "The Gorgon," the young daughter of a Pisan nobleman who has been heroically killed, comes to be solemnly invested as the figurehead virgin who will maintain a lantern to celebrate the men's victorious return. In charge of the home guard is an ambitious young Florentine who feels deprived of the forthcoming honour and glory, and who seeks revenge by violating the sacred person of the virgin. He gains access to her well guarded quarters, but when the Gorgon falls helplessly in love with him, his desire for vengeance falls away. His plot exposed, he commits suicide rather than invoke the wrath of the Pisans. The Gorgon too takes her life by throwing herself from a high tower. Meanwhile, the victorious Pisan vessels return.

The well off daughter of a tenor breaks up a romance with a helpful youth from a misunderstanding. But she continues to cover him with his gambling debts despite her delicate health.