Giulio Marengo is a middle-aged architect living in Florence, leading a comfortably monotonous life. His routine is disrupted when he meets Francesca, a lively young woman who closely resembles a former lover from his youth. Her uncanny resemblance and wild spirit intrigue him, and he is drawn into an unexpected and passionate relationship that revives feelings he thought were long buried. As they navigate the complexities of their age difference and their vastly different perspectives on life, Giulio is torn between his established existence and the exhilarating novelty that Francesca represents.

Their relationship weaves through moments of intense romance and stark reality, igniting questions about love, memory, and the passage of time. Giulio's professional life and personal relationships become increasingly strained as he struggles to reconcile his feelings for Francesca with the responsibilities he cannot ignore. The tension builds as the consequences of their involvement begin to unfold, leading Giulio to face crucial and life-altering decisions. Both must confront their desires and the implications of their connection as they are swept up in a whirlwind of emotion that challenges their views on love and identity.