Fourth in the Selkie Tales series, Changing Tides opens with Malachy, King of the North American Selkies still missing. Last seen on the coast of Oregon, Regent Roane sends Annie and her friends to search for the missing king. Angus, King of the East Coast Finfolk and his brothers accompany them to learn why the King of the West coast Finfolk, Donal MacAvoy is requesting an alliance. Caught in the middle is a young boy who exhibits the powers of a Finfolk and a selkie. When the boy is kidnapped by The MacAvoy in the heat of a battle with Angus, Annie must risk her life to save him as well as try to find the missing King.