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After one of his operatives is murdered, Tom Saxby of the U.S. Secret Service enlists Lieutenant Brass Bancroft, a transport pilot, to infiltrate a smuggling ring that is bringing aliens across the Mexican border. To gain the confidence of the ring, Brass is arrested on a charge of counterfeiting and locked in a cell with Ace Hamrick, a known member of the gang. After the cellmates stage an aborted prison escape, Ace is sent back to jail and Brass is released to infiltrate the ring. Having learned from Ace that the smugglers are operating out of the Los Angeles Air Taxi Company, Brass approaches manager Edward Powell about a job. After winning the confidence of ringleader Jim Cameron, Brass is hired to transport aliens across the border. Complications arise, however, when Gabby Watters, Brass's friend and radio operator, meets the pilot in a bar and is knocked unconscious during a fight. Brass takes his friend to the gang's hideout at a gun club, where Ace, having escaped from jail, appears and accuses Brass of being a government agent. Luckily, Bancroft convinces Cameron that he really is involved in a counterfeiting ring and can procure the valuable plates for him. Knowing that he must convey Cameron across the border with the aliens in order to arrest him, Brass tricks the ringleader into accompanying him to Los Angeles to buy the plates. His plan goes awry when Gabby overhears talk of smuggling and notifies the border patrol. After a dizzying battle during the flight, Brass safely lands the plane, turns the smugglers over to the authorities, and is warmly greeted by his fiancée, Pamela Schuyler.