'This is the acme of policy-relevant, intellectually coherent scholarship. It explores the challenges facing the EU in providing effective security at, within, and even outside its borders while preserving the personal and societal liberty at the core of democracy. Largely implicit suggestions that a zero-sum relationship between security and liberty can and should be avoided underlie both the framework and the meticulously objective analyses of the several chapters.' Martin O. Heisler, University of Maryland, USA 'Delivering liberty' would seem an obvious task for democracies, but the book - and the CHALLENGE research project that originated it- explores the reasons why this remains a challenge. It interrogates the conceptual, empirical and normative relations between liberty and security and does so by fruitfully contesting the boundaries between different research disciplines and by engaging with policy makers and the public.' Angela Liberatore, Directorate General for Research, European Commission 'This book presents the result of the five-year research project CHALLENGE (The Changing Landscape of European Liberty and Security) which focused on the contemporary balance between liberty and security in Europe... given the monumental size of the research project, which involved 23 universities studying nine issue areas, the editors succeed in granting space to most of the findings of the project.' Political Studies Review