The European Union faces a set of inter-related crises that it struggles to contain and address. By exploring how the EU responds to crises and conflict, this volume addresses both its resilience and vulnerability. The EU faces significant challenges: European integration is increasingly politicised; democratic politics within member states are increasingly volatile; challenger parties threaten the status quo; and party systems are shifting throughout Europe. These crises test both the EU and individual states, especially those that had to exchange interdependence in the Union for dependence on the Troika. Despite the tension of hard times, this volume points to patterns of continuity and change as the single market, somewhat side-lined and forgotten in the heat of crises, retains its role as the hard core of the Union and the EU’s most significant achievement. This book was originally published as a special issue of West European Politics.