"At a quarter to eight tonight, a GENTLEMAN will visit you. He would like your help with something very important. Don't be surprised if your visitor is wearing a MASK." When a powerful but confused king asks for Sherlock Holmes' help, it is obvious that he cannot refuse. However, the detective has no idea that this case will bring him face to face with a woman who is as smart, cunning, and quick as he is. Has Holmes finally found an equal opponent?