This book is an answer to "Discovery of India" by Jawahar Lal Nehru. The book provides an alternate narrative to the idealogy of Pakistan by asserting that the identity of Indus people has been different from that of Ganges people throughout our 5000 year old history.
The three periods in which the subcontinent was politically, economically and socially united were Mauryas, Mughals and British period and if we add these periods of united India, the time Indus is separate and distinct from Ganges is more than the time it is part of Ganges.