Heinz Halm's work presents a thorough discussion of the history, theology, and current state of this branch of Islam. Newly revised, Shi'ism includes updated information on the fate of the Shi'ite revolution in Iran as well as a new chapter on Iraq. Halm explores how Shi'ism differs from the rest of Islam, discussing the prominence of its authorities, the Imams, as well as its legal system, practices of worship, places of pilgrimages, and a religious ethos characterized by a fervor to suffer for the cause.