Psychological thrillers focus on characters' unstable mental states and complex relationships. They emphasize characters relying on mental rather than physical strength as they battle for equilibrium in their own minds or prey on each other mentally. Common themes include death, loss of reality, identity struggles, and guilt. Psychological thrillers commonly use first-person narratives and ambiguity about reality to focus on characters' minds. They tend to be set in urban areas and use costumes to portray characters as fitting social norms. Cinematography, music, and iconography like knives and shadows are employed to build tension and mystery.