Paul W. Kahn’s Political Theology: Four New Chapters on the Concept of Sovereignty is a compelling book, though compelling in a sense not unlike an intellectual bruise one is drawn to press on again and again. Ostensibly a re-purposing of Carl Schmitt’s 1922 Political Theology, Kahn’s book possesses a more ambitious armature than his title and the format of following Schmitt’s chapter scheme might suggest. Kahn is a legal scholar by training, and interested here in the problem of sovereignty, which takes him deep into questions of law, jurisprudence, constitutional reasoning, and forms of political organization. It is no less notable, however, that Kahn’s project weighs in on four classic philosophical and political problems . . . .