While at sea during a freak storm near his island home in the far north, a fisherman finds a baby girl, and though he and his wife love her as their own, they realize that they may not be able to keep her from returning to the sea.
When sixteen-year-old Elin Jean finds a seal pelt hidden at home and realizes that her mother is actually a selkie, she returns the pelt to her mother, only to find her life taking many unexpected turns.
Having escaped from her father's control with help from a handsome holy man who is king of a western land, fifteen-year-old Princess Margot finally travels to the sea where her mother lived, and from which she can draw a powerful magic.
When fifteen-year-old Peer Ulfsson witnesses the disappearance of his neighbor's wife, rumored to be a seal-woman, he must help protect the baby she leaves behind from trolls, a witch, and other creatures.
During the summer of 1987, Allie Jo, whose family runs an antebellum Florida hotel, meets Chase, who is staying there with his father, and they become friends when they discover a mysterious teenager hiding on the grounds of the hotel.
Eleven-year-old Gavin, devastated when his beloved grandfather suffers a massive stroke, recalls that Grandad had been speaking about the selkies--magical seal people--at the moment of his attack, and sets out to see if the selkies can help him reach his comatose grandfather.
Orphan Corinna disguises herself as a boy to pose as a Folk Keeper, one who keeps the Evil Folk at bay, and discovers her heritage as a seal maiden when she is taken to live with a wealthy family in their manor by the sea.
