In 1923 recently widowed Megan Colbin believes that in death her late abusive husband did one good deed for her unlike what he did to her in life; he left her a cottage near allegedly cursed Findloss, Scotland. A storm buried the coastal village under tons of sand only fifty years later, Findloss resurfaced with all its buildings intact, but not a soul or human remains anywhere. Lachlan arrives from seemingly the sea and introduces himself to Megan. He explains he is a Selkie warrior who is on a mission to prevent a nasty peer from causing havoc on land and at sea; and he is also seeking the human female whose heart has called him. As the widow and the Selkie investigate, they learn Megan's husband and his family were implicated in a wizard's evil that needs to be destroyed before more innocent people under the sea and on the coast die.