Raised by Natalie Brennan, a flamboyant and irresponsible mother, Ziggy Brennan gets involved in hustling men at a young age. She hangs around with a wild crowd and learns gets her "street smarts" first from her mother, who wants everyone to think they are sisters, and then from Denny Reagan, an older man. He starts teaching her his tricks of the trade and she falls right in line with his crooked ways. Then one night she meets Martin J. 'Mart' Neilson, a tall, handsome, honest farmer boy who's a sailor and they fall in love. While he's away fighting the war, she discovers she's pregnant.
You can now watch That Brennan Girl online on the following streaming providers in the United States.
| Writing | Adela Rogers St. Johns | Story |
| Writing | Doris Anderson | Screenplay |
| Directing | Alfred Santell | Director |
| Camera | Jack A. Marta | Director of Photography |
| Crew | Howard Lydecker | Special Effects |
| Crew | Theodore Lydecker | Special Effects |
| Visual Effects | Lewis W. Physioc | Matte Painter |
| Costume & Make-Up | Adele Palmer | Costume Supervisor |
| Sound | George Antheil | Original Music Composer |
| Art | Russell Kimball | Supervising Art Director |
| Art | James W. Sullivan | Art Direction |
| Editing | Arthur Roberts | Editor |
| Art | John McCarthy Jr. | Set Decoration |
| Art | Otto Siegel | Set Decoration |
| Sound | Cy Feuer | Music Director |
| Costume & Make-Up | Peggy Gray | Hairstylist |
| Costume & Make-Up | Bob Mark | Makeup Supervisor |
