Alfred Hitchcock's The Lady Vanishes

Passengers on a scheduled train out of the mountainous European country of Mandrika are delayed by a day due to an avalanche, and thus get up close and personal with each other out of necessity in the only and what becomes an overcrowded inn in the area. Once the train departs, the one person who it is uncertain is on the train is a middle aged English governess named Miss Froy (Dame May Whitty).