The author starts by explaining why equality and ethics are the key parts of modern political philosophy. He then presents utilitarianism as the historical source and counterpoint of most modern political philosophy. Then he proceeds to actual modern theories such as liberalism, libertarianism, marxism, communitarianism etc. with well-balanced and seemingly fair assessments. This book should suit beginners perfectly and more advanced practitioners can also spend some time re-reading it. I don't know any other overview of contemporary political philosophy which would match it in depth and clarity.