The lady vanishes

This movie is set in a train where a young woman travels with an old lady known as Miss Froy. Now the young lady falls asleep and wakes up to find out that Froy has disappeared into thin air. Everyone in the train including the ones in the compartment claim that they have never seen any such lady with any such features described by this young woman. All the passengers in the train suddenly start behaving mysteriously and once again kudos to Hitchcock for weaving such a beautiful mystery with minimal possible resources. The pursuing investigation depicts the young lady just had some wild hallucinations and there never was such a lady known as Miss Froy on the train. But the young lady could not believe that such vivid memories were only hallucinations. She finally finds a companion who would believe in her and agrees to help her in the the investigation of the vanishing lady. This is a lightweight suspense movie with all the characters beautifully woven by Hitchcock. Again the suspense lasts till the final minute when all the pieces start falling into place.