As Roberto explores the different cabinets in the hold, he remembers chapters from his youth: Ferrante, his imaginary evil brother; the siege of Casale, that meaningless chess move in the Thirty Years' War in which he lost his father and his illusions; and the lessons given him on Reasons of State, fencing, the writing of love letters, and blasphemy.

In this fascinating, lyrical tale, Umberto Eco tells of a young dreamer searching for love and meaning; and of a most amazing old Jesuit who, with his clocks and maps, has plumbed the secrets of longitudes, the four moons of Jupiter, and the Flood.