Sibling rivalry beneath the waves creates havoc in King Neptune's household. Sentencing his eldest daughter for "crimes against nature" to a statue along the shores of Mermaid City, Virginia, Serena must take human form and find true love before the autumn equinox.
Bound by necessity, through an arranged marriage, Nadine, King Neptune’s youngest daughter, is banished from court. Hoping to regain her freedom, Nadine uses her wiles to convince her husband to release her from her vows.
When Prince Triton, the only son of King Neptune decides it's time to cut the apron strings and strike out on his own. He manages to get a post at the Council of Twelve working for his Uncle Pales. There he meets a delightful mermaid, Danu who is not interested in his royal state.