This is a valuable book, for it gives a concise and objective exposition of the fundamental tenets of communism, and then outlines the bearing that the teaching of Marx and his followers has upon Christianity. In view of the emotions currently stirred by any consideration of communism and the difficulty of understanding Marx's own writings, a calm and dispassionate thumb-nail sketch of the main theses of communism, such as this, should contribute much to an intelligent understanding of what the author calls ""the most coherent philosophy and the greatest single emotional drive that this generation has to deal with."" The second half of the book in which the author attempts to set forth the Christian attitude towards communism is less clear and less satisfying. He does, indeed, avoid two extremes: the regarding of communism as the arch-enemy of Christianity, and the identification of the class-less society of Marx with the Kingdom of God. His book, then will be regarded as unsatisfactory by Roman Catholics at one end and by left-wing religious liberals at the other. But such is the importance of the subject that the book should have many readers.