When we consider the ideal of the `family' of nations implied by the European Union, it seems unnatural to deal with the question of where Europe's borders lie. Yet the question is urgently raised by grave issues of internal and external security. As the European Union's imminent eastward and southern expansion becomes reality -- side by side with the evolving new emphasis on security spawned by the events of September 11, 2001 -- we must be sure that the Schengen norms remain viable. It is also crucial to take full account of the impact of the enlarged European Union on the non-candidate countries of Eastern Europe. This important book takes the position that trust is the essential ingredient. Fourteen distinguished authors reveal various ways of achieving a level of trust among the members of the enlarged European Union adequate to the need for full freedom, security, and justice. The contexts in which trust must be established include police and judicial cooperation; the fight against terrorism, organized crime, and human trafficking: the latent threats to freedom of movement posed by national responses to increased immigration; and the transparent extension of EU Justice and Home Affairs measures to the candidate countries. The authors include political actors, policymakers, advisers, experts, and researchers from all parts of Europe. Their individual and collective contributions, in each case built solidly on thorough analysis of the relevant issues, bring a wide range of profound and wide-reaching insights to a vital subject. The book is of great significance not only for those charged with law enforcement and security, but also to all academics and policymakers concerned with the future of Europe.