In the Po Valley during the 19th century, a rich girl engaged to a well-to-do farmer ends up penniless and is forced to work for her fiancé’s relatives. Peasant unrest, carried to extremes by both workers and landowners, leads to violence and tragedy.

Renzo and Lucia's love story is jeopardized by Don Rodrigo, a wicked nobleman, who is interested in Lucia. When she refuses his attentions he has her kidnapped and brought to a convent whose prioress is a nun as wicked as he is. The two youths will have to go through a lot of misfortunes before being reunited and being able to marry.