Already by the name it becomes clear that this story contains many secrets and mystics. All events revolve around Miss Ellen Marchant, confidential clerk and typist to James Melrose. Mr. James Melrose, the eminent head and only partner in the firm of Melrose and Clapstone. Her father was rich, everyone knew that he led the „"dark"" affairs. He had a large Crocksands estate that Ellen could get. She gave up everything that connected with her surname and decided to start a new life with a new job. However, she finds a letter from a dead father sent to her boss.