Mystery

Mystery film is a sub-genre of the more general category of crime film. It focuses on the efforts of the Detective, private investigator or amateur sleuth to solve the mysterious circumstances of a crime by means of clues, investigation, and clever deduction. The successful mystery film adheres to one of two story types, known as Open and Closed. The Closed mystery conceals the identity of the perpetrator until late in the story, adding an element of suspense during the apprehension of the suspect, as the audience is never quite sure who it is. The Open mystery, in contrast, reveals the identity of the perpetrator at the top of the story, showcasing the "perfect crime" which the audience then watches the protagonist unravel, usually at the very end of the story, akin to the unveiling scenes in the Closed style. Suspense is often maintained as an important plot element. This can be done through the use of the sound track, camera angles, heavy shadows, and surprising plot twists.... full article at wikipedia