To write a mystery novel, one needed to refer to relevant books to learn the basic elements and structure of a mystery novel, such as plot design, character creation, character relationships, and so on. At the same time, he also needed to read other excellent detective novels to broaden his horizons and enrich his imagination. In order to prepare to write a mystery novel, one needed to invest a certain amount of time and energy. First of all, he needed to make a detailed plan to determine the storyline, characters, scenes, and other elements, and gradually improve them. Secondly, he needed to do a lot of reading and research to understand the plot and structure of other mystery novels, as well as the common reasoning techniques and techniques. In addition, it also needed to be revised and polished repeatedly to ensure that the novel was logical and coherent. Writing a mystery novel required ample preparation time and investment, as well as continuous learning and practice. As long as one had enough patience and perseverance, one could create an excellent mystery novel.