When sixteen-year-old Aileen Shay sees a dead girl floating in the bay during a midnight yacht party, she never imagines Jamie Flannigan, her new boyfriend, may be involved. The only thing she knows about Jamie is that he personifies the one thing she has been drawn to her entire life – the ocean. But as she grows closer to him, she realizes he knows more about the murder than he’s telling. When another girl is attacked, and Jamie refuses to answer her questions, Aileen searches for answers on her own.

Aileen learns that Jamie’s family belongs more to myths and legends than they do in the real world. They are selkies, and after the Flannigans threaten her family, Aileen suspects they are responsible for both attacks.

But they aren’t the only ones in her small fishing town who can keep a secret. As Aileen uncovers the truth about the murder, the selkies, and her own family, she learns why her soul is bonded to the sea. But with that revelation comes a choice – to permanently sever her connection with the water, which comes at a painful cost, or embrace a legacy that just might get her killed.