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The services of the brilliant detective Charlie Chan (Sidney Toler) are required again when an espionage ring attempts to steal secret plans from the U.S. government. After one of the spies is killed by a colleague, the murderer makes off in a car stolen from radio star Diane Hall (Helen Devereaux), but Chan soon discovers that this isn't just a coincidence. Something strange is going on at the Cosmo Radio Center, and Chan is just the man to find out what it is. Wikipedia