This document discusses the genre of detective fiction across various mediums such as film, literature, and television. It explores common elements of detective stories, including the character of the detective as either a professional or amateur, working alone or in a team. Investigations often center around solving mysteries related to a specific person, object, or crime. The genre also examines psychological themes through the portrayal of murderers with mental disorders and traumatic pasts. Across media, detective fiction blurs generic boundaries and may incorporate elements of other genres like science fiction, documentaries, comedy, horror, and thriller.