Mariano, an energetic and eccentric octogenarian, wanders in a state of confusion on a beach on the Roman coast. He has a wound on his forehead and no papers or memory of his recent past. Dario is the young policeman who rescues him. Transported to the emergency room, the elderly man resolutely refuses to be medicated. He wants to leave with Dario. He is convinced that the policeman is his son and does not want to part with him.