A betrayed husband plans the perfect murder of his wife. If things don't go according to plan, he can switch to plan B. The thriller was shot in 3D, but never shown in cinemas as such. Nevertheless, with his low camera angles and his isolation of certain objects, Hitchcock was clearly aiming to exploit powerful 3D effects. Hitchcock made no effort to hide the fact that the story was based on a play (by Frederick Knott, who also wrote the screenplay): by placing virtually all the action in a British living room, the film remains remarkably theatrical. That does not detract from the tension, on the contrary, but it does ensure a curious contrast: The 3D technique was intended to offer audiences a cinematographic experience with which television could not compete, but Dial M for Murder turned out to be a typically theatrical film. Will be screened in 3D during the festival.