This insightful book analyzes the evolution of the operational tasks and cooperation of the European Border and Coast Guard Agency (FRONTEX), the European Asylum Support Office (EASO) and the European Union Agency for Law Enforcement Cooperation (EUROPOL). Exploring the recent expansion of the legal mandates of these decentralized EU agencies and the activities they undertake in practice, David Fernández-Rojo offers a critical assessment of the EU migration agencies.