1190 AD, the Third Crusade is engulfing the Holy Land. A young assassin returns home to Alep from an arduous journey, and finds it under attack by Templars. He has no choice but to repel this attack, killing a low-ranking captain in the process. Soon he is tasked by Al-Mualim to find and retrieve a sacred object: the Chalice. It is said to have the power to unite under one flag all the factions of whatever side possesses it - either the Crusaders or the Saracens - and end the Third Crusade in victory for one side or the other. But the Chalice is too powerful an object to be left in the hands of men alone: It must be found and destroyed.