En route from Amsterdam to Cardiff, Wales, the crew of KLM Cityhopper Flight 433 report an engine problem and head back to the airport. But just as they're about to touch down, the dual turboprop banks sharply to the right, the wing grazes the ground, and the aircraft crashes and breaks apart on a field next to the runway. Of the 24 people on board, two passengers and the captain are dead. And when investigators from the Dutch Safety Board pore over the evidence, they determine that a minor circuitry problem sparked a cascading series of fatal errors.