Detective Novels refer to a specific genre of literature primarily centred around the investigation of a crime, often murder, by a protagonist who is typically a detective, either professional or amateur. This literary category can span across various sub-genres like adult mystery books, involving complex and sophisticated plotlines intended for mature audiences, and mystery science fiction books, which combine elements of crime-solving with speculative technology or otherworldly settings. These books are characterized by their suspenseful, puzzle-like narratives that invite readers to piece together clues and solve the mystery alongside the characters.