This book presents an authoritative account of the part played by Britain in the research and development of the first atomic bombs. In addition to explaining the contributions in scientists and scientific ideas that Great Britain made, the author also reveals the political and administrative problems of this project from the British perspective. The first part of the book examines British studies on the feasibility of a bomb. The next two sections discuss the collaboration between British and American projects, the problems that the collaboration incurred, and the exodus of British scientists to North America as the 1940s and the war progressed. Appendices include the Frisch-Peierls Memorandum and the Maud Reports.