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 very 20 minutes. What follows is cat and mouse game played at 40,000 feet, with the lives of 200 passengers hanging in the balance.