Charlie Chan (17) Charlie Chan At The Olympics 1937
https://www.imdb.com/title/tt0028708/
When a strategically important new aerial guidance system is stolen, Charlie traces it to the Berlin Olympics, where he has to battle spies and enemy agents to retrieve it.
Director: H. Bruce Humberstone
Writers: Robert Ellis(screen play), Helen Logan(screen play), Paul Burger(original story)
Stars: Warner Oland, Katherine DeMille, Pauline Moore
When an experimental plane is hijacked and its pilot murdered, the new guidance system that will allow it to fly unmanned is stolen. Charlie traces the strategically important invention to the current summer Olympic games in Berlin, where myriad spies, enemy agents, and hard-core criminals are ruthlessly pursuing it in order to sell it to another government. Charlie's son Lee, a member of the U.S. Olympic Swim Team, is on hand to help his father recover the device and solve the mystery.
Trivia: Stock footage of the dirigible Hindenburg was retouched, frame by frame, to blot out the swastikas emblazoned on the airship's tail.
Goofs: The radio direction finder used by the German Police is clearly marked as made by an American Company and sports a compass rose marked in English ('E' for East and so on, instead 'O' for Osten). Even if the German police would operate imported equipment, the markings would be in German. And it is unlikely that the Nazi regime would allow import of anything the German industry was able to produce, not to mention that German radio equipment of the time was among the best in the world.
Quotes:
Charlie Chan Jr: Gee, Pop, they're having as hard a time finding that plane as we are catching fish.
Charlie Chan: Fish in sea like flea on dog - always present but difficult to find.