First published as "Popper" by Fontana Paperbacks, London, 1973, this edition is the same excellent presentation of the epistemology of Karl Popper, the greatest philosopher of science of the XXth century.
Bryan Magee gives with this book a clear outline of Popper's philosophy based upon his theory of knowledge. Popper's is a systematic philosophy, the study of the natural world (science) and the understanding of society and politics, are parts of a single philosophy. We find the same epistemology applied to the logic of scientific discovery and to politics through the vision of the open society. The best introduction to Karl Popper.