Hercule Poirot (David Suchet) faces one of his most baffling cases when an overbearing American businessman turns up stabbed to death aboard the Orient Express, a pan-European train that becomes stuck in a snowdrift en route from Istanbul. With no help available from the outside, Poirot must rely on his famous "little grey cells" to ferrett out the killer. Philip Martin directs this adaptation of the classic Agatha Christie whodunit.