Althea, Atlantis’ heiress, is killed by her jealous reborn half-sister Mara at her wedding.
Reborn three days early, she finds Mara’s affair with her fiancé and marries vagabond Dorian.
Dorian is Poseidon, the sea god, who comes to repay a debt to her mother.
Mara throws Althea into the sea, yet Poseidon reveals his true form.
With the tide necklace, Althea defeats Mara and becomes Queen of Atlantis.