A detailed treatise on one of the signs of the hour, the arrival of al-Mahdi, a rightly guided leader for the Muslims. A matter of controversy and part of the creed of Muslims, al-Mahdi is a topic surrounded by misconceptions and misunderstanding. Dr Muhammad Ahmed Bin Ismail Al-Muqaddam details the many narrations transmitted from the prophet Muhammad (saw) and his companions about al-Mahdi and critically analyses them, filtering the authentic from the inauthentic and explaining the view of Ahl Al Sunnah Wal Jama'ah on this important topic.