Having once started reading this fiction, I was completely immersed in the mysterious story presented by the book. As the saying goes, “Well begun, half done”. At the beginning of the story, just like many other detective stories, the author gives us a brief description of the condition by the words of a client. However, unlike other ones, this story first delineates the client’s strange behavior at length to indicate the severity of the incident in order to attract the readers to continue reading it. As is known to all, vivid depiction is essential to detective stories since it can help the readers understand each figure’s characteristics and visualize the scenes, thus making the story more authentic and attractive. Therefore, trying to present a “real world” to his readership, Sir Arthur Conan Doyle, author of the original “Holmes series”, has skillfully arranged the plots of the whole story from the perspective of Dr. Watson, a character not so specialized in discovering the truth hidden behind the enigmatic happenings as Holmes but so loyal to Sherlock Homes as a friend that he always accompanies Holmes wherever he goes. In this way, he elaborately depicted every scene and character in the book, Apart from the special start, the ending of the whole story, being dramatic but reasonable, is certainly an outstanding one. After all, except the author himself, who knows that the Duke’s seemingly ordinary secretary is in fact the Duke’s bastard? In addition, who knows that the Duke actually has already been acquainted with the whole thing before