Mystery novels can generally be categorized according to the rigor and logic of the plot. 1. Suspense and mystery novels: This type of novel increases the reading pleasure by setting suspense and mystery to let the reader guess the answer during the reading process. 2. A logical mystery novel: This type of novel reveals the truth behind the story by establishing a reasonable logical reasoning process. 3. Psychological mystery novels: These novels mainly focus on the reasoning process of the characters 'hearts and promote the development of the story through the changes in the characters' psychology. 4. Supernatural mystery novels: These novels use supernatural phenomena to make inferences, such as mysterious events, supernatural phenomena, etc. According to these classifications, mystery novels can be divided into the following categories: 1. Suspense mystery novel: By setting suspense and mystery to attract readers to read and increase reading pleasure. 2. A logical mystery novel: Through the establishment of a reasonable logical reasoning process, the truth behind the story is revealed. 3. Psychological mystery novels: promote the development of the story through the changes in the psychology of the characters. Supernatural mystery novels: use supernatural phenomena to make inferences such as mysterious events, supernatural phenomena, etc.