It was a state-of-the-art commuter plane making a simple one-hour flight from Taipei to a Taiwanese island off the coast of China. But within minutes of takeoff, TransAsia Flight 235 plunged into the Keelung River, killing all but 15 people on board. To determine the cause of the crash, investigators examine stunning footage captured by the dashcam of a passing car and uncover shocking evidence about the captain and even the airline itself.