This book is the fifth and the last volume of a much larger project, Ancient Pakistan - An Archaelogical History. which deals with the prehistory of Pakistan from the Stone Age to the end of the Indus Civilization. This volume deals with the decay and demise of the Indus Civilization and its devolution into post-Harappan regional cultures under the impact of the intruding pastoral nomads from the West, the Indo-Aryans being one of them. A comprehensive bibliography is provided for those who want to dig deeper into the subject.