'This book is a magisterial and monumental treatment of the author's chosen topic. … almost impossible to do justice to the richness of this book. What it reveals is that what people think about the idea and practice of citizenship varies both widely and subtly within individual Member States across time (and according to their different histories) and simultaneously, across Member States as they respond in their own ways to migration, immigration, globalisation, international law and in the case of the new Member States, struggle with the processes of democratisation. … the reader is constantly helped through the complexity of the material by regular summaries of what has been said, and why, and signposts to what is coming. … it is a must for the same range of scholars as the range and depth of scholarship that is brought to bear by its author.' European Foreign Affairs Review