As he returns from mission and plans to stop for a few days in Istanbul, Hercule Poirot is urgently reminded in London. We are in winter and at this time of year, the Orient Express usually runs almost empty. Yet, without the help of the company's director, Hercule Poirot would not have found a place on board, as if all the passengers had made an appointment on this train! From the first night, a man was murdered. The train is stopped by the snow that prevents the murderer from escaping. In the isolated wagons of the rest of the world, Hercule Poirot, at the top of his art, leads the investigation. And it is not the tracks that are missing!