En route from Washington, D.C. to Columbus, Ohio, United Express Flight 6291 is on its final approach when the high-performance twin turboprop crashes just a mile from the runway. Three survivors emerge from the inferno, but the disaster claims the lives of the three crewmembers and the other two passengers on board. The charred remains leave little for investigators to work with. That is, until the cockpit voice recorder reveals the smoking gun.