The story revolves around Rosaria Parondi and her four adult sons—Vincenzo, Simone, Rocco, and Ciro—who migrate from the impoverished rural south of Italy to the bustling, industrialized metropolis of Milan in search of a better life. Seeking to escape destitution, the family initially rallies around Vincenzo, the eldest, who is already established in the northern city. However, the harsh realities of urban survival quickly fracture their tight-knit familial bond. The narrative delves deeply into the corrupting influence of the big city, poverty, and unchecked ambition, which slowly poison the brothers' relationships.Simone, possessing a striking physique and a reckless nature, is drawn into the brutal world of professional boxing. Guided by a shady manager and intoxicated by the bright lights of Milan, Simone’s ego and greed spiral out of control. He soon becomes obsessed with Nadia, a cynical, fiercely independent local prostitute. Nadia initially mocks Simone, but eventually enters a destructive, passionate relationship with him, driven by her own self-destructive impulses and need for survival.Rocco, the gentle, deeply moral, and self-sacrificing brother, returns from mandatory
military service and immediately tries to rescue Simone from his downward spiral. To pay off Simone’s mounting gambling debts and protect the family's honor, Rocco reluctantly agrees to step into the boxing ring himself, utilizing his own athletic talent. As Rocco’s boxing career skyrockets and he achieves fame and financial success, Simone’s life completely unravels. Consumed by jealousy, resentment, and a deep sense of inadequacy, Simone sinks further into petty crime and desperation, completely alienating himself from the rest of the family.Tragedy reaches its breaking point when Nadia attempts to leave Simone for Rocco, recognizing Rocco's purity and kindness. Blinded by fury and possessiveness, Simone violently attacks Nadia, committing a horrific
act of violence that destroys any remaining illusion of family unity. When Ciro, the youngest and most pragmatic brother who has successfully integrated into the working class through a factory job, discovers the truth, he realizes the devastating extent of Simone’s moral decay. Rocco, despite everything, continues to forgive his brother, pleading for mercy, but the damage is irreversible. The film concludes on a profoundly melancholic note, illustrating how the ruthless pressures of modern capitalism and urban migration tore apart a family that could not survive its own internal demons, leaving Ciro to look toward a lonely, uncertain future while carrying the heavy burdens of the past.