Mystery film

A mystery film is a genre of film that revolves around the solution of a problem or a crime. It focuses on the efforts of the detective, private investigator or amateur sleuth to solve the mysterious circumstances of an issue by means of clues, investigation, and clever deduction.
The plot often centers on the deductive ability, prowess, confidence, or diligence of the detective as they attempt to unravel the crime or situation by piecing together clues and circumstances, seeking evidence, interrogating witnesses, and tracking down a criminal.
Suspense is often maintained as an important plot element. This can be done through the use of the soundtrack, camera angles, heavy shadows, and surprising plot twists. Alfred Hitchcock used all of these techniques, but would sometimes allow the audience in on a pending threat then draw out the moment for dramatic effect.
This genre has ranged from early mystery tales, fictional or literary detective stories, to classic Hitchcockian suspense-thrillers to classic private detective films. A related film subgenre is spy films.