ONDINE is a lyrical modern fairy tale that tells the story of Syracuse (Colin Farrell), an Irish fisherman whose life is transformed when he catches a beautiful and mysterious woman (Alicja Bachleda) in his nets. She says her name is Ondine, which means "she came from the sea". His daughter Annie (Alison Barry) comes to believe that the woman is a selkie, a magical seal/woman creature, while Syracuse falls helplessly in love. In the Celtic myth, a selkie is able to become human by taking off her seal coat, and can return to seal form by putting it back on. However, like all fairy tales, enchantment and darkness go hand in hand. Annie hopes that Ondine has come to live on land for 7 years and that she can use her selkie wish to cure Annie's kidney failure. Whenever Ondine is onboard Syracuse's fishing boat, she sings a siren song, and his nets and lobster pots are full of fish and seafood in tremendous numbers hard to believe. However, being Irish, Syracuse (or "Circus" the nickname he is trying to outlive, one he has earned for his previous hard drinking ways) is mistrustful of good luck, with it comes bad.