In a maternity hospital, young single mothers are accompanied by social worker Hélène Lambert, who tries to make them aware of their new responsibilities, while Dr. Baurain stresses the importance of their moral and sexual education. They come to the aid of several young women: one who would like to give up her child to a couple applying for adoption, another who, after the death of her first baby in dramatic circumstances, is expecting a second, and many others.

When peasant girl Nives is deserted by smuggler Gino Lodi, she betrays him to the police. Police officer Enzo Cinti, who loves Nives, traces her to the Po River cane-fields, where she is working as a cutter to support herself and an infant son, and warns her that Gino has escaped from prison and is seeking revenge. She rejects his offer to protect her. Gino finds Nives, mourning the drowning death of their son. He surrenders himself to the police and then walks at Nives' side in the funeral procession.