Book excerpt: In Where Three Worlds Met, Sarah Davis-Secord investigates Sicily's place within the religious, diplomatic, military, commercial, and intellectual networks of the Mediterranean by tracing the patterns of travel, trade, and communication among Christians (Latin and Greek), Muslims, and Jews. By looking at the island across this long expanse of time and during the periods of transition from one dominant culture to another, Davis-Secord uncovers the patterns that defined and redefined the broader Muslim-Christian encounter in the Middle Ages.