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An armored mail truck has been held up by three masked bandits, and 22 sacks of registered mail have been stolen. Though badly beaten, mail guard Bud Huston (Don Warren) is able to recall that one of the bandits was referred to as "Sid." But the clue that enables Friday (Jack Webb) and Smith (Ben Alexander) to close in on the outlaws is a $20 bill that has somehow ended up in the possession of a petty thief. This episode is based on the Dragnet radio broadcast of May 15, 1952.