This document outlines ideas and techniques for a psychological thriller film plot and production. The plot would involve a teenage girl who loses her best friend to murder and begins attending therapy. Through this, she meets a boy who is actually the killer with an obsession for long hair. Locations around London with Victorian vibes would be used. Costumes would emphasize the main character's distress and the killer would always be in black. Tight shots and muted colors would build suspense. Sound effects like heavy breathing would add to the thriller elements.