What's the difference between a crime novel, a mystery novel, and a detective novel?

Crime novels, mystery novels, and detective novels are all types of novels. The main difference between them is: 1. Thesis and Plot: Crime novels usually involve crime, murder, robbery, fraud, and other criminal activities. They mainly tell the story of how the protagonist discovers the crime, tracks down the criminal, and reveals the truth. Suspense novels focused more on the psychological, human, emotional, and other elements of the characters, as well as escape rooms, conspiracies, murders, and other plots. They mainly described how the protagonist solved the mystery and revealed the truth in a story full of suspense and tension. Detective novels were more focused on how the protagonist solved the case through investigation and analysis. 2. Writing style and technique: The writing style and technique of crime novels and mystery novels are different. Crime novels usually emphasized the plot's tightness and tension, and used a lot of descriptions to let the readers feel the protagonist's mental journey and the changes in the characters 'emotions. Suspense novels, on the other hand, focused more on the psychological and human nature of the characters, using a large number of hints and metaphor to let the readers guess and reason in the story. Detective novels, on the other hand, focused more on the protagonist's investigative and analytical abilities, using a large amount of historical background and knowledge to let the readers feel the protagonist's intelligence and wit. 3. Audience and influence: The audience groups of crime novels and suspense novels are also different. Crime novels were usually targeted at adult readers. They mainly talked about criminal activities and the psychology of the characters, which involved social reality and human nature. Mystery novels were more targeted at young readers, mainly about the psychology and emotions of the characters, as well as escape rooms, conspiracies, murders, and other plots involving youth, love, friendship, and other topics. Detective novels, on the other hand, were mainly targeted at adult readers. The main story was about the protagonist revealing the truth of the crime through investigation and analysis to solve the case. The story involved law, crime, psychology, and other knowledge.