the "Flying G-Men", one of whom is disguised as "The Black Falcon", fight to protect the United States and its allies from an enemy spy ring and to avenge the death of the fourth Flying G-Man, Charles Bronson.

Bronson was killed when he attempted to stop enemy agents from stealing the new McKay military aircraft, designed by Billy McKay. The Junior Air Defenders are also enlisted to help the Flying G-Men.

A plot to infiltrate all military factories and airports is discovered but the spy chief called "The Professor" is unknown.

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