" The Last Case " was one of the famous detective novels created by Conan Doyle, a British detective novel. It told the story of the famous detective Holmes and his assistant Watson solving a series of complicated cases together. In The Last Case, Sherlock Holmes and his assistant investigated the various fields involved in the case, including natural sciences, social sciences, humanities, and so on, in order to find the truth. They continued to dig for clues and deduce the truth, eventually revealing the truth of the case and also revealing the various contradictions and problems of society and human existence. In the novel, Holmes and Watson worked together to solve a series of complicated cases. At the same time, the novel was also full of humor and reasoning elements, allowing the reader to constantly guess and think while reading. The Last Case was one of the classics in Sherlock Holmes 'series of novels. Through the exploration and reasoning of detectives, it showed the power of human wisdom and knowledge, and also revealed the various contradictions and problems of society and human existence.