To understand the role of Islam in what became the first "Islamic state,", one must know the role it has played in history in this area of the world. Professor Abbott's 1968 book does just that.
The first chapter is the best and most interesting as it lays down the basics and setting the record straight. Abbott understands the complexities of what is now Pakistan. That doesn't mean to say he is uncritical. He demonstrates how both Islam and Pakistan are neither monolithic or unchanging as much as some ethnocentric Westerners would believe.
The successive chapters are less interesting, a bit long-winded, and in my estimation, geared more for the specialists. The main issue covered here is the conflicts between the traditionalists and the reformers throughout the centuries which exist to this day in that part of the world. A few of the empererors of the Mughul Empire were actually quite ahead of their time.
The book leads the reader right up to the independence period and then stops abruptly.
Still, I would recommend this book to help understand the dynamics of Islam today in Pakistan and I would certainly read it before venturing into G.H. Janssen's MILITANT ISLAM which has a lot on Pakistan.