Plot
Charlie Chan investigates the theft of government radar papers (the laboratory is located in the same building as a radio station!) with the help of Number Three Son Tommy and comic sidekick Birmingham Brown.
Where to watch The Scarlet Clue?
The Scarlet Clue is a mystery movie featuring Mantan Moreland.
The Scarlet Clue is currently streaming for free (ad-supported) on Freevee, Public Domain Movies and Xumo Play.
It is also possible to buy The Scarlet Clue on Amazon Video.