The film's non-linear structure opens with a scene from the end: Antonio, Nicola, and Luciana arriving at a lavish villa, having found the owner's driver's license. They see the owner, Gianni, about to dive into his pool, and the frame freezes. The film then spends two hours explaining how they reached this moment of reunion and discovery. Throughout the narrative, we see Gianni's rise to wealth is built on betraying his leftist ideals, culminating in his marriage to Elide Catenacci, the daughter of his corrupt developer client. A key hidden element is that while his friends assume he has struggled like them, Gianni has become immensely wealthy, a fact he actively hides during a reunion dinner that ends in a fight.
A tragic turn is the suicide of Gianni's wife, Elide, who feels unloved and identifies with the alienated women in Antonioni's films. Her death frees Gianni but leaves him emotionally hollow. In another key twist, Nicola, the intellectual purist, participates in a TV quiz show about cinema to win money. He answers every question correctly but loses everything on the final question about "Bicycle Thieves" because his detailed, academic answer is deemed incorrect by the show's simplistic standards, a bitter irony that seals his fate as a noble failure.
The ending reveals the full weight of Gianni's choices. After a chance meeting where Gianni pretends to be a simple traffic warden, his friends find his lost wallet and go to return it to the address on his license. When they arrive at the villa, they realize the depth of his deception. They leave the license at the gate without a word, understanding that their friend is lost to them, his wealth having created an unbridgeable chasm. Gianni secretly watches them leave, filled with regret but unable to face them. The final line, "We wanted to change the world, but the world changed us," becomes Gianni's tragic epitaph, underscoring that his success is his greatest failure.