A contest is being held in Cremona for the best violin, with Giannina's hand in marriage as the prize. Filippo is secretly in love with her, but is also ashamed of being a cripple, so he switches his superior violin with that of another apprentice, Sandro, whom Giannina loves.
A man from a wealthy family falls in love with a florist, but the lover has to go to war and to leave his darling crying... and giving birth to a child.
At trial the prosecuting attorney makes a startling confession: the defendant is his son whose pitiful fate led him to murder. The attorney left the young man's pregnant mother, and the unwed poor thing had to fight against a hostile world.
