Parker O'Neill, using a summer hiatus to explore his familial roots in Ireland, inadvertently witnesses a murder and finds himself fighting for his life on the rugged coast of Donegal. Summoning his twin sister through the telepathic ability they share, she rushes to his rescue.

But to find him, she must enlist the aid of recovering alcoholic and former police inspector Kevin Hennessey, who wants nothing to do with the beautiful America telling him a wild story about murder and danger - all of which she has only seen in her mind.

Each reeling from a painful divorce, they try to keep their relationship on a strictly platonic footing; but the wildness of the sea, the magical legend of a lost selkie prince, and their own desperate efforts to find and save her missing brother before it's too late bring them together on levels neither one could ever have imagined.