The Lady Vanishes

In the fictional country of Mandrika, travelers on a trans-European train are stopped for the night due to bad weather and are hosted by a local hotel. Socialite Iris Henderson (Margaret Lockwood) meets a sweet, kind old governess named Miss Froy (May Whitty). Iris later wakes up from a nap to only to find out that Miss Froy has vanished and is nowhere to be found. None of the other people seem to have any recollection of Miss Froy. One of the passengers, a Czech psychiatrist named Dr. Hartz (Paul Lukas) even suggests that Miss Froy never existed. He states that since Iris was hit on the head before boarding, Miss Froy is a figment of Iris' imagination. However, Iris is convinced that something sinister is afoot, and teams up with another passenger, the musician Gilbert (Michael Redgrave), to find Miss Froy before the weather breaks and the train journey resumes.