In Terror by Night (1946), the train setting creates a tense feeling by trapping the characters in a small space, where no one can leave. This makes the story feel more intense as a murder happens, and the characters must interact closely, which builds suspicion and urgency.
The story is seen mostly from Sherlock Holmes’s view, which lets the audience follow his thought process. This view pulls viewers into Holmes’s mind, so they feel like they are helping solve the mystery. It makes the audience feel involved as they watch Holmes piece together clues and figure out each character’s motives.