Hercule Poirot (Alfred Molina) investigates the fatal stabbing of an arrogant American businessman (Peter Strauss) aboard the elegant train from Istanbul to Paris. Caroline: Meredith Baxter. Nina: Leslie Caron. Helena: Amira Casar. Pierre: Nicolas Chagrin. Vera: Tasha De Vasconcelos. Bob: David Hunt. William: Adam James. Bouc: Fritz Wepper. Phillipe: Kai Wiesinger. Mary: Natasha Wightman.