Thriller films follow conventions to build tension and engage audiences, including innocent protagonists in difficult situations, mysteries or false accusations, and an increasing pace leading to a climax. Common thriller themes involve crime, murder, revenge, romance triangles, mystery, isolation, voyeurism, and psychological elements. Settings are often isolated rural areas or urban environments enabling hiding. Protagonists are usually innocent heroes unaccustomed to danger, while antagonists include criminals, stalkers, assassins or psychotic individuals. Editing and sound techniques like montages, altered camera angles, and non-diegetic ambient sounds also build tension in thriller conventions.