Die Ungläubigen

The novel is the portrayal of an English-born man named David, who is captured as a very young child and sold into slavery to Baibars, a Mamluk officer. He becomes a devout believer in Islam and takes the Arabic form of his name and the surname of a convert, Daoud ibn Abdullah. He develops into a gifted warrior and assassin. He is sent to the Papal Court in the 13th century as a spy, in order to foil an alliance between the Christian West and the Mongolian descendants of Genghis Khan to exterminate the Muslim faith and capture the Holy Land.