Crime fiction, also referred to as detective fiction, mystery fiction, or thrillers, is a genre of literature that revolves around criminal activities, investigations, and solving crimes. These stories are usually set in a dark and gritty environment and are full of twisted plots, suspense, and unexpected twists. Noir fiction is a subgenre of crime fiction that focuses on bleak, pessimistic themes and features morally ambiguous characters. Cozy mysteries, on the other hand, are lighthearted and more wholesome, emphasizing the comedic and amateur detective elements. Legal thrillers and police procedurals are also crime fiction subgenres that feature specific legal and law enforcement procedures. Ultimately, crime fiction offers a diverse and exciting range of subgenres that can cater to the varied preferences of readers.