El Senor del Cero = The Zero Man (Paperback)
Jose is a young Mozarab who has been forced to flee Cordova. His great talent for mathematics provokes great envy. At the Ripoll Monastery he teaches Arabic numbers and, at the same time, bears witness to the struggle of the Catalonian people to free themselves from Frankish rule. Jose's knowledge becomes suspect to those fanatics who set out to stop him.