This is the master detectives first American adventure. A British Secret Service operative, carrying top secret microfilm from England to Washington disappears, fearing for his safety he passes the microfilm, hidden in a match book, onto another passenger, the agent is reported missing and Holmes (Basil Rathbone) is called in to recover the microfilm before it falls into the wrong hands. Filmed during World War II Holmes and Watson (Nigel Bruce) are up against an international ring of spies in a race against time.
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