Sheriff Stilinski and his wife couldn't have children. In her desperation, Mrs. Stilinski found a young Selkie boy and hid his sealskin. Only she knew where it was hidden; when she died, so did that knowledge. Stiles grew to love his human family as his own, even grieving the death of his captor/mom, but the sea still calls to him in Beacon Hills.

Eames is a were-unicorn, and Arthur is the architect unknowingly out to destroy Eames' home. The rest is just a fairytale love story.