Dr Rosenthal describes the contemporary spiritual and intellectual crisis of Islam. The unity of religion and politics, essential in classical Islam, has largely disappeared. In Islam there has been no counterpart of the Reformation in the West; and, in the absence of radical reform, a vulnerable religious and political system has capitulated step by step to a secular nationalism which in turn has grown out of resentment of foreign influence and domination. The result is a very confused situation, close analysis of which is essential to an understanding of the place of Islam in the modern national state. Dr Rosenthal bases part of his book on the available source material; but the greater part derives from personal observation during visits to Pakistan, India, Malaya, Iran, Turkey, Tunisia and Morocco. He writes always as a detached observer and does not apply the criteria of the West to what are essentially Muslim dilemmas and problems.