There are already many excellent books on existentialism. Some of them deal with particular problem or particular existentialist writers. Most of those that deal with existentialism as a whole divide their subject-matter according to authors, presenting chapters on Kierkegaard, Heidegger, Sartre, and the rest. Thus I think that there is room for the present book, which attempts a comprehensive examination and evaluation of existentialism, but does so by thematic treatment. That is to say, each chapter deals with a major theme of existentialist philosophy, and these themes are arranged in the order of the existential dialect. Of course, each chapter is illustrated with material from the writings of existentialists, from Kierkegaard to Camus.