Beginning with the only clue that he has, a nun as a witness, Alan Ladd (playing postal cop Al Goddard) proves a tenacious force, driving his way from clue to clue until he has tracked down the gang.
When he has finally got the gang in his sights, he then poses as a corrupt postal cop in order to infiltrate the gang and foil the crime.
Although things go reasonably well, we're invited to take a look at Al's character as agent of authority, which is established early on. Al, it appears, is driven only by one thing, and that is his work. Even his colleagues are bemused in fact by Al's attitude. He foregoes everything, and lives in a kind of existential isolation, with only his work, which even in itself does not appear to be enough for him.
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