Chapter 1 introduces the concept of the sovereignty cartel, the idea that states do not just compete with each other to maximize the national interest or cooperate with each other to provide global public goods, but also collude with each other to reinforce the centrality of the sovereign state as a category of actor in international relations. It reviews the existing international relations literature on state sovereignty and locates the idea of the sovereignty cartel within that literature. It develops the metaphor of the cartel and gives an overview of how this metaphor is developed throughout the book. It looks at different understandings of property rights underlying the idea of the sovereignty cartel and introduces the possibility that these understandings are not mutually compatible. Finally, the chapter provides a plan of the book and an overview of the chapter structure.