Three Star (not his real name), played by Lyle Talbot, is a hot shot pilot for a small airline who likes showing off his flying skills with acrobatics a little too much for the boss' liking. However, he is chosen to fly a very special cargo - a top secret new explosive - to Washington but just before the flight he is beaten up by some mysterious thugs.
Thus instead the brother (Robert Light) of his girlfriend Judy (Ann Dvorak) takes the flight, which ends in an explosion! Judy heads out to see what really went on, with Three Star close behind...
This is a really good film with some excellent aerial scenes. The plot is simple but well worked out and the bad guys suitably menacing, deadly and scheming. The hero Three Star is, as so often with films of this period, equal parts heroic and annoying.