Francis Ryan, living high-and-free-wheeling life as the wife of gangster "Smiley" Ryan, spends some time behind bars as a result of her husband's activities, and, when she gets out, realizes she has been a bad example for her kid-sister, Jennie White, and five of her friends. With the aid of her old boyfriend, she manages to divert them from their juvenile-delinquent path leading to disaster for each.
Is Girls Under 21 on Netflix? Unfortunately the movie Girls Under 21 is not yet available on Netflix.
| Directing | Max Nosseck | Director |
| Writing | Jay Dratler | Screenplay |
| Writing | Fanya Foss | Screenplay |
| Production | Ralph Cohn | Producer |
| Camera | Barney McGill | Director of Photography |
| Editing | Charles Nelson | Editor |
