This chapter takes stock of the third edition of European Integration Theory in three steps. First, it offers a comparative perspective on the distinct contributions to the mosaic of integration presented by each chapter. The assessment is framed by three sea-faring metaphors of European integration, and details the insights derived by each of the book’s contributions from addressing the kind of polity, politics, and policy based on the three types of crises (i.e. economic, refugee, and security). Second, the chapter addresses the absence of security crises in the book’s contributions. To reverse that absence, it distinguishes the impact of integration along a horizontal regional comparative dimension and a vertical normative dimension. The former builds on insights from regional integration, the latter connects normative crises in EU sub-units with global conflicts. And third, the chapter addresses the question of how integration theory fares sixty years on from the Treaty of Rome, and points out potential issues and themes for the future of European integration theory.