As the world focuses on the conflict in Iraq, the most important political players in that country today are not the Sunni insurgents. Instead, they are Iraq's Shi'I majority--part of the Middle East's ninety million Shi'I Muslims who hold the key to the future of the region and the relations between Muslim and Western societies. So contends Yitzhak Nakash, one of the world's foremost experts on Shi'ism.