During the twelfth century, Jerusalem was a Christian kingdom, after being recaptured from the infidels during the First Crusade. Here and in the surrounding lands, the differences between Christians and Muslims loomed large. A Holy War continued between the two groups, each pressing the truth of its own faith. Or so it was in theory. In reality, commercial rivalries and cultural differences divided both sides, and leaders made common cause with a faction of the enemy whenever it suited them.

Into this cauldron of danger, intrigue, and civility comes Prince Aidan of Rhiyana. Seeking only adventure, he arrives at his kinsmen's castle just after its lord Gereint has been stabbed to death. The tragedy bears the mark of the mysterious Assassins. A young boy of the family is the next victim. Aidan swears to extract vengeance. He sets off to face down the assassin in a...