In December 1935, when his transcontinental luxury train is stranded by deep snow, detective Hercule Poirot is called on to solve a murder that occurred in his car the night before, with a multitude of suspects.
 
FUN FACT:  Since Albert Finney required many hours of make-up procedures before shooting each day, and because he was performing in a stage play at the same time, he didn't have much time for his badly needed sleep. A daily routine was developed where an ambulance arrived to pick up the sleeping actor at his house, in his pajamas, carefully, trying not to wake him up. During the half hour commute to the studio, the make-up artists would begin the rough work on his face. The rest of the fine detail work was completed at the studio on a still sleeping Finney.