One of the very best Poirot episodes. Who cares if they rewrote the novel? It's still an absolutely superb film: beautiful music (wonderful use of Purcell's "Dido's Lament"), fantastic acting, great plot, and a brilliantly dramatic dénouement. I've seen some Christie adaptations that change the plots for the worse, and become disjointed and unpleasant experiences as a result. This is not one of them - it is an outstanding piece of filmmaking. Poirot at his peak!