There were several steps to creating a mystery novel: 1. Decide on the theme and plot: The theme and plot of a mystery novel are the key factors. You need to determine the core elements of the story such as suspense, crime, detective, psychology, etc. Then you need to come up with an interesting plot to attract the interest of the readers. 2. Collect evidence and clues: In the plot of the novel, some evidence and clues need to be set up to allow the reader to infer and guess the truth. The evidence and clues could be a person's behavior, diary, letters, photos, fingerprints, and so on. 3. Establishing relationships between characters: In mystery novels, you need to set up some characters to let the reader understand their personality, motives, and background. These characters needed to have a certain amount of conflict and interaction to resonate with the readers. 4. Construct a world view and background: In the world of a mystery novel, some background and rules need to be set so that the reader can understand the environment and conditions of the story. For example, a small town, an ancient building, a mysterious organization, and so on. 5. An outline and draft: Before you start writing, you need to make an outline and draft to plan the plot and character relationships. An outline could help determine the key points and direction of the story, and a draft could allow one to start writing down words so that they could be revised and polished. 6 Writing and Revising: After completing the outline and draft, you can start writing. The writing process required repeated revision and polishing to ensure the logic and cohesiveness of the story, as well as the character and motivation of the characters. Release and publicity: After the novel is completed, it needs to be released and publicized to attract more readers. It could be published through online platforms, publishing houses, and other means. At the same time, it needed to be actively promoted to increase the popularity and influence of the novel. These were the basic steps of writing a mystery novel. Of course, the specific creation process still needed to be adjusted and changed according to personal preferences and actual situations.