The thing that makes this book different from the other books of "OCCULTATION" by Sheikh Saduq, Allama Majlisi and other writers, is that the present book contains many traditional reports not mentioned by Saduq and Allama Majlisi, especially regarding the imamate of Imam Musa Kazim (a.s) and refutation of Ismailism and other sects who diverged before the Twelfth Imam. In the words of Sheikh Tusi himself " the aim of this book is to explain the causes of occultation of Imam, reason of its prolongation, hurdles in reappearance and benefits of Imam's existence. The Arabic text is on one side of the page and English translation on the opposite side. H/B pgs 567
