"The Intruder" is a psychological thriller film that revolves around a young couple, Scott and Annie, who purchase their dream home in California. Their idyllic life takes a dark turn when they encounter the previous owner, Charlie, who becomes increasingly obsessed with the house and the couple. As Charlie intrudes into their lives, the couple faces escalating tension and danger. The film explores themes of obsession, trust, and the impact of past traumas, leading to a suspenseful climax that tests their relationship and safety.