Non-Stop (2014)

Bill Marks is a burned-out veteran of the Air Marshals service. He views the assignment not as a life-saving duty, but as a desk job in the sky. However, today's flight will be no routine trip. Shortly into the transatlantic journey from New York to London, he receives a series of mysterious text messages ordering him to have the government transfer $150 million into a secret account, or a passenger will die every 20 minutes. As the threats become terrifyingly real, Marks must race against the clock to uncover the killer among the 150 people on board, all while the evidence begins to frame him as the hijacker. *Non-Stop* earns its place on a list of best mystery movies by masterfully executing the classic "locked-room" scenario. Set at 40,000 feet, the film presents a finite list of suspects where the killer must be on the plane, creating an intense atmosphere of paranoia and claustrophobia. The central puzzle isn't just a "whodunit," but also a "howdunit," as the killer seems to operate with impossible knowledge and precision. The narrative excels at misdirection, casting suspicion on nearly every passenger and crew member, forcing both the protagonist and the audience to constantly re-evaluate who can be trusted. By brilliantly turning the investigator into the prime suspect in the eyes of the world below, the film adds a layer of psychological tension that elevates it beyond a standard action-thriller into a tightly wound and compelling mystery.