Set against the backdrop of the modern, yet soullessly industrial landscape of Milan, the narrative unfolds the decaying marriage between Giovanni, a successful novelist, and his wife, Lidia. The emotional disconnect between the couple is palpable, as Giovanni's interests seem more inclined towards his work and potential affairs, leaving Lidia to wander through the streets and hospitals of Milan, haunted by the ennui of her life and her failing relationship. Their emotional estrangement is starkly portrayed through their interactions and the urban milieu they navigate, which reflects their inner turmoil and the existential crisis that grips them both.

During an evening at a wealthy industrialist's party, the couple encounters various characters that serve to mirror and exacerbate the complexities of their relationship. It is here that they meet Valentina, the daughter of the industrialist, whose youthful exuberance and outlook contrast sharply with the couple's jaded perspective. The opulence of the party and the interactions with their social circle bring to the fore the couple's personal despair and the superficiality of their lives. As the night progresses, their encounter with Valentina instigates a series of reflections and actions that underscore the deep chasm between them and the longing for something more meaningful beyond the facade of their existence.