A mystery film is a type of movie where the story involves finding out something that was hidden or is unknown. In a mystery movie, the audience often tries to guess the answer to a secret or the identity of a mysterious person as the movie goes on. Usually, in a mystery movie, the protagonist (main character) is trying to solve a crime or a problem – like who stole a valuable item, or why somebody died. By the end of a mystery film, all of the mysteries are usually solved and the truth is revealed.