This book examines the use of internment without trial in Northern Ireland between 1971 and 1975. This research provides a more comprehensive account of internment and assesses previously unexplored aspects of its use. The book considers the high politics and intelligence surrounding the introduction of internment and in doing so accepted narratives regarding the measure are challenged. The book also highlights long-term and short-term consequences which developed from the internment period; some of which have not been given adequate consideration before. In addition this book traces the evolution of 'The Troubles' outside of Belfast and Derry/Londonderry between 1970 and 1972. It is argued that the development of the dynamics of the conflict across the whole of Northern Ireland was certainly more gradual and possibly less inevitable than has been previously identified.