Gerbert, a French monk educated in the sciences and literature of Muslim Spain, has risen to the Chair of St. Peter as Sylvester II, and for a brief while co-rules the Holy Roman Empire. His friend Zosimus has compiled his writings into a book at the behest of Pope Benedict VIII. An archbishop, Arnulf, jealous of Gerbert's prominence, hears of the book and wants it to expose him as an agent of Satan.
Benedict has political reasons for...