The Lady Vanishes 1938
On a prepare headed for England a gaggle of vacationers is delayed by an avalanche. Holed up in a resort in a fictional European nation, younger Iris befriends aged Miss Froy. When the prepare resumes, Iris suffers a bout of unconsciousness and wakes to search out the outdated lady has disappeared. The opposite passengers ominously deny Miss Froy ever existed, so Iris begins to research with one other traveler and, because the pair sleuth, romantic sparks fly.