Brethren

A detailed, epic historical adventure set in Paris, London, Egypt, and Palestine on the eve of the last Crusade, Brethren tells the story of a young knight's search for a mysterious (and potentially deadly) book belonging to a secret organization within the Knights Templar. When young Will Campbell joins the most powerful organization in Europe, he is given the task of recovering a heretical book stolen from the order's vaults--but the book hides the covert plans of a secret group within the Temple, and it seems that everyone around Will is ready to kill to possess it. Brethren also traces the rise of an ambitious commander in the Egyptian army, who, after assassinating the sultan, takes control of Egypt and Syria. The two stories come together during his campaign for a new Holy War that will cripple an empire and bring the Crusaders to their knees.--From publisher description