This is the fourth volume of the Ancient Pakistan - An Archaeological History. It deals with a number of issues of the Indus Civilization, which are primarily of theoretical importance. The main topics that have been discussed are the social and political organization of the Harappan society, the Harappan religion, the Indus script and language, the beginning and the end of this vast civilization, and the recent attempts in creating some myths around the Indus Civilization. Since this volume is primarily dedicated to the theoretical and the abstract, descriptive material is kept to a minimum.