The beautiful but sad story of the sea nymph Ondine, who longs to possess a human soul. A mysterious and romantic fantasy with a constant background of the sea.

The wilful spirit Ondine is adopted by a poor fisherman and his wife, who lost their own baby daughter many years before.

Ondine falls in love with the handsome knight Sir Roland, and they are married, but Ondine finds it difficult to live in the human world.

The royal Princess Brianna, previously engaged to Roland, is furious that he has betrayed her, but Ondine reveals that Brianna is not really a princess at all.

Who is Brianna? And what happens to her, Sir Roland and Ondine?

All three are united by the mystical forces of destiny.