Thriller films aim to keep audiences on the edge of their seats through mystery and suspense. They build tension using ominous music, mysterious characters and events, and twists and enigmas that make audiences question what will happen next. Effective thrillers start with a normal beginning but then introduce crisis, threats, and conflicts for the protagonist to overcome. Editing and cinematography also build tension through techniques like quick cuts between short clips and settings that emphasize mystery through colors and locations.