The book beautifully establishes that the Awaited Imam A.S. was forced to live in hiding and went into occultation to return when the signs related in Hadith are fulfilled. The writer comprehensively presents the historical background which led to the Imam's occultation from the time of Imam Jafar Al-Sadiq A.S, the sixth Imam. He refers the evidence concerning the Imam's occultation, citing all the well-known and established texts. The work is one of the most complete reference books on the subject in English language. H/B