Rome, 2014, late summer. While he is reading on his sun-drenched terrace, Giangiacomo's heart stops. A quick, painless death--something he had always hoped for, his daughter, Elvira, remembers. A few days later, Elvira comes across an unfinished manuscript in her father's flat. In it, she discovers a love story between Giangiacomo--Gigi, to his loved ones--and a Belgian journalist, Clara, which had been going on for over four years. Gigi's manuscript tells of how their "mature love," an expression that became code between Gigi and Clara, blossomed unexpectedly and of the happiness of their meetings, the abandon of their bodies, their laughter, the films they watched and rewatched together. As she struggles to cope with the loss of Gigi, Clara writes her own version of their story. Her "journal of absence" is first addressed to Gigi, then, gradually, to Elvira. She confides in the young woman on the threshold of adult life, with discretion and tenderness, describing the fullness of the hidden love she shared with her father.