In "The Human Factor", a police artist uses a sketch compositing computer program to produce an image of the suspect in a homicide investigation. When Mario Larouche, an arson investigator from Montreal, is murdered in a motel in Toronto, there is a witness—a woman whom he had picked up, who saw the probable killer leaving the room. However, although she has a clear idea of the appearance of the murderer, it requires a police artist to consult with her in the production of an actual sketch of the suspect suitable for showing to people who may be able to identify the face.