It's all over for David Fraser, a sailor who's lost in the ocean. But after a week at sea, he's rescued by a mysterious, beautiful woman who tends to him at her home on a small island near the shores of Scotland.

Gilly is a selkie, a seal-woman who can shed her sealskin to walk among humans. She is intrigued by David, powerfully drawn to him, and he to her. But when he learns her secrets, his betrayal may mean the end for both of them.