Robert Ryan plays Scott, a mounted Coast Guard officer who suffers from recurring nightmares involving a maritime tragedy. He sees himself immersed in an eerie landscape surrounded by a shipwreck and walking over skeletons at the bottom of the sea while a ghostly blond woman beckons him from afar. He thinks he is going mad but at the same time he decides to propose to a girl working at Geddes, a local shipyard catering to Coast Guard needs; she accepts. It seems that the girl has a strong resemblance to the ghostly blond of his nightmares.