Starting from a medieval commentary by the Spanish priest Beato di Liebana and its stunning illustrations (Codex vit 14-2 of the National Library of Madrid), Umberto Eco comments on and analyzes the vision of Patmos.

He reminds us of the beginning of history, describes the waiting for the millennium, does not hesitate to talk about the Revelation as a daily, nightmarish experience, and reaches up to our days describing the heirs of this terrifying book.