Winter and Isidor are two hot-blooded Siblin brothers who've been sailing the world in search of their father, taking their pleasure with women they find wherever the ship docks. When at last they locate their father's vessel, it's docked at Nanine Island, at the mouth of the dangerous Brecca Straight where seductive singing sirens have been wrecking ships for two hundred years. The two meet Soule, a beautiful red-haired siren their father adopted when she was a child. They learn that they share a lifelong bond with her, and endeavor to rescue her from enemies who are out to destroy the siren for having killed their parents. As her enemies close in, her brothers are swept away in a flood, leaving her alone to face those who have sworn to kill her. And now the flood waters rising fast, and her fate hangs in the balance.