Khilafat o Malookiat (Caliphate and Kingship), authored by Abul A'la Maududi in 1966, is a seminal work examining the historical transformation of the Islamic caliphate into a monarchical system. While the original text is in Urdu, it has been translated into English under the title "

Verdict

Is it worth reading? Yes, with critical engagement.
It is not neutral history; it is a powerful polemic. If you want to understand the Islamist critique of monarchy and dictatorship, this is a foundational text. However, for a balanced view, you should also read responses such as:

The book has shaped the political thought of numerous Islamic movements globally. By emphasizing that the Caliphate is a system of principles rather than just a historical era, Maududi provided a blueprint for those seeking to reconcile Islamic governance with modern political structures.

While originally written in Urdu, the book has been translated into English under several titles. If you are searching for a PDF or physical copy, look for:

The Role of Scholars: Discussion on religious and political differences and the historical role of the Ulama .