Under the magical light of the full moon, mermaid Oceania reaches her long-awaited eighteenth birthday. Now, she is free to explore the land in human form and, hopefully, to discover her special talent. During her midnight voyage to the surface, Oceania meets Xavier, a handsome land boy who aspires to become a musical composer, despite his wealthy father’s wishes that he run the family business. With Xavier’s help, Oceania discovers her special talent, one that links the two to the depths of their souls, both musically and romantically. But little does Oceania know that she and her family are the victims of a generations-long mermaid’s curse: She can travel freely between land and sea for twelve moons following her eighteenth birthday, but then she must choose one or the other and remain there—permanently. As Oceania’s romance with Xavier blossoms, she is faced with a heart-breaking choice. Should she decide to make her life on land with the boy she loves, or return to the bottom of the ocean to live with her family? And can she find a way to break the curse?