The author of this book is professor of modern history at the University of Cambridge, England. He also has had a long-standing interest in the role of Christianity in history. Therefore, his discussion of the present international situation and of the part organized Christianity and individual Christians should play in it is thoughtful study. He believes that Christian forces can do much to alter the course of history. He is also committed to the establishment of an international order in which communists and non-communist nations would play a part side by side. He opposes what he calls ""ideological diplomacy"" based on the promise that the of is a necessary condition to a peaceful world. A book which attention that it is likely to get in America's present mood.