On another world, another time, at the Great Festival of Ascension, the young chieftain Elsu woos a beautiful maiden named Kai. She accepts his proposal, but a misunderstanding causes Elsu to swear a rash vow to win her hand. Now Elsu, together with Bane, his best friend, and Kai, sail to the forbidden sunken city of Angor Drava, lost beneath the waves a thousand years before, to steal the diamond eyes from a statue. But Bane harbors secrets and Elsu refuses to believe warnings of a terrible evil dwelling in the temple.