Purpose The purpose of this study is to critically review the book Islamic Law and International Law by Emilila Powell. Design/methodology/approach The book review is undertaken from a comparative legal and political science perspective, including arguments and insights from international relations, international law, Islamic law, Islamic culture, religious studies, legal history and European as well as international political history. Findings While the empirical part of Powell’s work (chapters 5, 6 and 7) shows a methodologically veryc well done approach and at the same time highly interesting insights, both foundation and context show several critical points, in particular, a lack of differentiation with respect to the Western politico-legal tradition, its concepts and the resulting implications. Research limitations/implications The book represents an excellent starting point that should inspire new, more intensive as well as exhaustive research on this topic. Practical implications The book generates valuable insights for practitioners such as judges at international courts dealing with issues involving so-called Islamic law states, as well as politicians or public service officials in the context of international law and international politics. Originality/value As the paper is a comprehensive review of the book based upon comparatively based insights from international relations, international law, Islamic law, Islamic culture, religious studies, legal history and European as well as international political history, the arguments of Powell are analyzed and commented upon in a comprehensive, well-founded and fair way. This should give potential readers a good understanding of Powell’s arguments, inspire a critical lecture of the book and contribute to the important discourse on the connex between international law and Islamic law.