| Director | John Cromwell |
|---|---|
| Genre | drama film, film noir, prison film |
| Runtime | 96 min |
| Country | United States |
| Box office | $1.5 million |
19-year-old Marie Allen is sent to prison after a botched armed robbery attempt with her husband, Tom, who is killed. While receiving her initial prison physical examination, she learns that she is two months pregnant.
Marie has trouble adjusting to the monotonous and cutthroat world of the women's prison. She meets Kitty Stark, a murderous shoplifter, who promises Marie work as a thief when she is released. Kitty stresses the importance of toughness while incarcerated.
Informed that she may be paroled in ten months, Marie witnesses several prisoners who are granted parole but must remain in jail because their parole officers have not secured work for them. One such hopeless prisoner hangs herself and Marie's hopes for an early release steadily diminish.
Despite the rule of sadistic matron Evelyn Harper, Marie gives birth to a healthy but premature baby. She plans to grant temporary custody to her mother with the intent of taking the child after she is released, but Marie's stepfather will not allow the baby in his house. After Marie is denied parole, she tries half-heartedly to escape and the authorities force her to surrender her child for adoption.
The arrival of notorious criminal Elvira Powell triggers a rivalry with Kitty. Elvira bribes Harper to place Kitty in solitary confinement, where Kitty is beaten. When a kitten is found in the jail yard, Marie adopts it as a pet, but Harper tries to take it away, prompting the inmates to riot. The kitten is accidentally killed during the melee and Marie is punished for fighting with Harper.
Before taking Marie to a solitary-confinement cell, Harper shaves Marie's head, symbolically stripping her of her innocence. Harper has disagreements with sympathetic reformist prison superintendent Ruth Benton, especially after the latest incident with Marie. Because Harper is a political appointee, the police commissioner refuses to fire her and instead asks for Benton's resignation. When Benton declares that she will demand a public hearing, the resignation issue is dropped.
Kitty returns to her fellow inmates after serving a month in solitary confinement, but she is distraught and mentally unstable. After being harassed by Harper in the prison cafeteria, Kitty stabs her to death as the inmates watch and make no attempt to stop it. Marie, now hardened by her exposure to career criminals and sadistic guards, encourages Kitty in the fatal assault.
Eligible for parole once again, Marie claims to have secured a job outside the prison. However, the job is simply a ruse to win her release so that she can join Elvira's shoplifting gang. Marie leaves the institution a cynical, unscrupulous woman. At the conclusion, an office assistant asks Benton what to do with Marie's file, who replies: "Keep it active. She'll be back."