Lindsey N. Kingston’s new book, Fully Human: Personhood, Citizenship, and Rights (Oxford University Press, 2019) interrogates the idea of citizenship itself, what it means, how it works, how it is applied and understood, and where there are clear gaps in that application. This is a wide-ranging, rigorously researched examination of citizenship, statelessness, and human movement. And it is vitally relevant to contemporary discussions of immigration, supranationalism, understandings of national borders, and concepts of belonging. Not only does Kingston delve into theoretical concepts of citizenship and statelessness, she also integrates analyses of various kinds of hierarchies of personhood in context of these broader issues. The research also includes explorations of nomadic people, indigenous nations, and “second class” citizens in the United States within this theoretical framework of citizenship and statelessness. This careful and broad analysis defines the novel idea of ‘functional citizenship’, which is both theoretical and practical in considering citizenship and statelessness in our modern world. Fully Human focuses on the promises and protections that are outlined in the 1948 Universal Declaration of Human Rights, unpacking the protection gaps and difficulties that have become clearer and more acute in this era of globalization and security concerns, and highlighting some of the key problems with the current human rights regimes that are in place.