A former counterrevolutionary pirate befriends a mentally ill young woman and this in turn leads to tragedy when she falls in love with a French naval officer.

In 1620 pirates are terrorizing the Adriatic coast. Our hero sets out to defeat them.

The marquis Galeazzo di Torre Alta is murdered by a mysterious killer who calls himself Diabolicus. His heirs are his three brothers and a sister, but all of them, with…