Just happened to be watching Turner Classic Movies today, and saw that
36 Hours (1964 - James Garner, Eva Marie Saint, Rod Taylor) will be on TCM on Monday 11th, 4:15 PM.
36 Hours is based upon Roald Dahl's story
Beware of the Dog. The plot turns on a tiny detail that is overlooked by the Nazis. If you watch carefully at the beginning of the movie you will know what the detail is.
Edited to add - If you know what the plot detail is, do not disclose it until after the movie airs on Monday.
https://www.allmovie.com/movie/36-hours-v113359