This book gives an introduction to the concepts put forward by some of the main figures in the Existentialist school of thought and the historical roots from which these ideas came. I bought it because I'm a relative newcomer to philosophy and was very impressed. Barrett has a great eye for detail, whilst retaining a clear and lucid style. His analysis of the lives and thought of four main Existentialist thinkers - Kierkegaard, Nietzsche (forgive me if the spelling is wrong!), Heidegger and Sartre - is full of insight and reveals the linking threads that connect their ideas; and in fact it is this aspect of the book I liked the most. He draws out the links and hidden themes that run through the writings of the four thinkers and Existentialism in general, and places all this in a firm historical context to show how the ideas have developed from various sources - not just philosophy but literature, art, politics and so on. What we end up with is a conception of the world quite different from that put forward by other schools of philosophy; the focus is on our existence in the world, and the nature of this existence as experienced by us, with all our imperfections and limitations. The main question seems to be: 'is there any meaning to human life?' Overall it's very easy to read, provides a lot of food for thought, and fulfils its stated task admirably. I almost don't want to give it five stars because that's what everyone else seems to have done - but it really is that good. Highly recommended.