The document discusses several codes and conventions of the mystery genre that will influence the filmmaker's project. It notes that mystery films are often set in modern urban cities which feel dystopian. The protagonist will have a questionable mindset that makes the audience distrust them. Technical elements like close-up shots, lighting, and music will be used to create tension and suspense. Specifically, lighting will have muted colors and use black and white to set a gloomy tone through homages to films like Enemy and Dr. Caligari. Themes of social subversion and questioning the protagonist's psychology seen in films by Lang and Hitchcock will also influence the project.