Sky Racket plot
Young Marion Bronson refuses to marry Count Barski, to whom her uncle Roger Bronson wants to marry her off. Marion flees to the airport, but is chased by Roger and Barski. She climbs into a mail plane, unaware that a gang of mail thieves wants to crash it near Hardcastle and rob it for the contents of the mail bags. Eric "Secret Agent 17" Lane has to investigate the thefts of the mail bags and chases the mail plane. Lane manages to save Marion, but both are eventually captured by the mail thieves. Lane tells Benjamin "Ben" Arnold, the ringleader of the mail thieves, that he has tracked down Marion to collect her uncle's reward. Arnold seems to believe Lane's story.