The document discusses key elements of an effective psychological thriller storyline. It notes that psychological thrillers are plot-driven with fast pacing and frequent crimes or obstacles to propel the story. More so than regular thrillers, they emphasize character development and exploration of the protagonist's impaired mental state. There are typically opposing sides, such as victims and police versus the protagonist, with characters trying to outwit each other psychologically rather than through brute force. It provides the film Psycho as an example that follows these conventions well.