Ambush (1939)

Four bandits swoop down on a California bank and flee with $98,000, leaving a truck as the only clue to their identity. Bank secretary Jane Hartman recognizes the truck as one on which her brother Charles worked. Fleeing to her brother, she is trapped by the gang: mastermind Gibbs, gunman Sidney, and blackballed airplane pilot Randall. Under threat of bodily harm to her brother, she lures truck driver Tony Andrews to the hideout and he is forced to help them in their escape attempt.