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 often conceals the identity of the perpetrator until late in the story, then adds an element of suspense during the apprehension of the suspect.

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. 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.

Mystery novels have proven to be a good medium for translation into film. The sleuth often forms a strong leading character, and the plots can include elements of drama, suspense, character development, uncertainty and surprise twists. The locales of the mystery tale are often of a mundane variety, requiring little in the way of expensive special effects. Successful mystery writers can produce a series of books based on the same sleuth character, providing rich material for sequels.

Until at least the 1980s, women in mystery films have often served a dual role, providing a relationship with the detective and frequently playing the part of woman-in-peril. The women in these films are often resourceful individuals, being self-reliant, determined and as often duplicitous. They can provide the triggers for the events that follow, or serve as an element of suspense as helpless victims.