Sam Hathaway left Capernaum Island with his widowed mother, planning never to return to the scene of his father's death at sea. Now a doctor who has faced the worst wartime battle injuries, Sam feels called to treat the families of Capernaum Island. Judith Morrison lives there with her father, the lighthouse keeper, who ridicules Sam for his fear of the ocean. Then a great storm hits, damaging the lighthouse and injuring Judith's father. Will she be able to keep the lamps lit?