A cargo flight from Luxembourg to Nigeria turns into a nightmare over the French Alps for its five-person crew. A large explosion has blown both engines off the right wing, the weather is worsening, and the cockpit has lost contact with air traffic control. It will take every bit of muscle and piloting expertise to steer the disabled Boeing 707 over the mountains and reach Marseille for an emergency landing. Witness the harrowing flight of Trans-Air Cargo Flight 671, then discover the microscopic but deadly flaw that almost doomed the plane.