Keith Robbins, building on his previous writing on the modern history of the interlocking but distinctive territories of the British Isles, takes a wide-ranging, innovative and challenging look at the twentieth-century history of the main bodies, at once national and universal, which havecollectively constituted the Christian Church. The protracted search for elusive unity is emphasized. Particular beliefs, attitudes, policies and structures are located in their social and cultural contexts. Prominent individuals, clerical and lay, are scrutinized. Religion and politics intermingle,highlighting, for churches and states, fundamental questions of identity and allegiance, of public and private values, in a century of ideological conflict, violent confrontation (in Ireland), two world wars and protracted Cold War. The massive change experienced by the countries and people of the Isles since 1900 has encompassed shifting relationships between England, Ireland (and Northern Ireland), Scotland and Wales, the end of the British Empire, the emergence of a new Europe and, latterly, major immigration of adherents ofIslam, Hinduism, Sikhism and other faiths from outside Europe: developments scarcely conceivable at the outset. Such a broad contextual perspective provides an essential background to understanding the puzzling ambiguities evident both in secularization and enduring Christian faith. Robbins providesa cogent and compelling overview of this turbulent century for the churches of the Isles.