The story revolves around two brothers from a noble family, the Albricci, who fall in love with the same woman. After her accidental death, one of the heroes joins the service of the French emperor and becomes a captain in his fleet, while the other sets sail and becomes a legendary pirate. Both swear to kill each other. One day, fate brings the blood brothers together on the high seas. They must test themselves in the greatest duel, a fight to the death.