Book excerpt: Sovereignty in the Age of Global Terrorism: The Role of International Organisations analyses the role of international organisations in adopting counterterrorism measures after 9/11 and the impact of these measures on the sovereignty of their Member States. The book examines the counterterrorism regimes of the UN and four regional organisations (with a special focus on the EU), as well as their implementation by their Member States. It includes the 2008 Kadi case of the European Court of Justice as case study of the conflicts between legal regimes that have competing mandates to fight terrorism. The relevance of the book lies in both comprehending the rationale for international actions against terrorism and the consequences on international law and State sovereignty.