When her family moves to Bar Harbor, Maine, for the summer, Lucy is more interested in watching the waves and a certain shipbuilder than ingratiating herself with the social elite. But Lucy’s mother will stop at nothing to keep Lucy and the shipbuilder apart, even if it means throwing Lucy into the arms of a wealthy man with a dangerous secret.

May feels her life drying up. The sea calls to her, but her parents forbid her from swimming. Yet after her 15th birthday, the urge to break free becomes overpowering and May makes a life-changing discovery. She is a mermaid --- a creature of the sea.