Egle (Anna Magnani) is an inmate of a female jail. Lina (Giulietta Masina) is a nervous newcomer who is much more temperate, with some naiveness even. Egle influences Lina and she convinces her so, successfully, Lina extorts the man who had incriminated her (Antonio Zampi detto Adone, by Alberto Sordi). Lina is released out of the prison thus. However, still in jail, Egle meets Lina again as she has been detained by exerting prostitution, with a marginal demeanor which is due to Egle's previous influence on her.