Prologue: the hooded friar -- A most solemn act of justice -- The Nolan philosopher -- "Napoli e tutto il mondo" -- "The world is fine as it is" -- "I have, in effect, harbored doubts" -- "I came into this world to light a fire" -- Footprints in the forest -- A thousand worlds -- Art and astronomy -- Trouble again -- Holy asininity -- The signs of the times -- A lonely sparrow -- Thirty -- The gifts of the Magi -- The song of Circe -- "Go up to Oxford" -- Down risky streets -- The art of magic -- Canticles -- Squaring the circle -- Consolation and valediction -- Infinities -- Return to Italy -- The witness -- The adversary -- Gethsemane -- Hell's purgatory -- The sentence -- The field of flowers -- Epilogue: the four rivers.