More adventures for the Belgian sleuth. In 'Yellow Iris' a new French restaurant is opening in London. Hercule Poirot (David Suchet) is reminded of an unsolved case that occurred at a restaurant with the same name in Buenos Aires. When events appear to be repeating themselves, Poirot is determined not to fail again. In 'The Case of the Missing Will' Poirot and Hastings are attending a Union Society debate where an old friend, Andrew Marsh, is one of the speakers. Marsh is in poor health and later that night announces that he intends to change his will the next day. But Marsh is found dead the next morning, and Poirot is immediately involved.