The tiny independent duchy of Ferrara is located between Casare Borgia's Rome and Venice, and Borgia has plans to conquer Venice via Ferrara. He murders his sister's husband and makes it appear that Alfonso D'Este of Ferrara was behind the killing. To avenge herself against Ferrara and D'Este, Lucretia Borgia marries D'Este and intends to poison him. But...she falls in love with him.

A Spanish army officer, Don Jose, stationed in Seville, meets and begins a relationship with a mysterious gypsy, Carmen. After he discovers she has cheated on him with his Lieutenant, he kills the officer and flees the city with Carmen. He recovers from his wounds and is forced to begin the life of a bandit.

Jealous invalid husband tries to kill sexy blond wife, who uses occult powers and devices to try to kill him.