Karen marries Alan Denver and returns with him to the cliff-side house next to the lighthouse he tends. However, she knows nothing of the death - or even the existence - of his first wife. Then she begins to sense strange ghostly presences about the house, and her husband starts behaving oddly. She senses, too, that Alan's mother, who lives nearby, is trying to break up her marriage - but why? The truth lies hidden behind a locked door, and in a scrap of rose point lace ...