After the death of the paranoid emperor Tiberius, Caligula, his heir, seizes power and plunges the empire into a bloody spiral of madness and depravity.
In a farmhouse in southern Italy, an old woman dies. Her husband summons their sons: from Rome, Raffaele, a judge facing a political case for which he risks assassination; from Naples, the religious and ideological Rocco, a counselor at a correctional institute for boys; from Turin, Nicola, a factory worker involved in labor disputes. Once home, each encounters the past and engages in reveries of what may come.
