The text analyzes in details the political-religious place of Imam Ali in Islam, his spiritual relationship to the Prophet Muhammad and his contribution in establishing the Islamic State and the spread of the Faith of Islam; it discusses him as a Caliph and as a statesman, and also what was said about his policy and statesmanship and the causes which led to the accumulations of the difficulties which prevented him from reaching a peaceful and more lasting rule during the days of his caliphate. Finally the book discusses the caliphate as a religious-political system and the kind of caliphate which is consonant with the nature of the Islamic message.