A vacation of a lifetime. A merman's secret. A kiss that changed one girl's life forever. After a freak accident aboard a yacht sends eighteen-year-old Ava Adair overboard, she discovers the existence of mermaids when irresistible Carter Stevens rescues her. But by saving her, Carter changes her life. Ava struggles to stay human and to keep her mermaid secret safe from those she loves most. As a mermaid, she must follow the laws and traditions of the sea, and her new merman king will wipe out entire coasts to protect the merpeople secret. Desperate to maintain a life on land, Ava and Carter must navigate their new world between the land and sea as accidental mates. Because if they can't, Ava will find herself imprisoned in a strange new world among the waves and will never see the beloved shores of her home again.