This book introduces readers to the key concepts of political philosophy: authority, democracy, freedom and its limits, justice, feminism, multiculturalism, and nationality. Accessibly written and assuming no previous knowledge of the subject, it encourages the reader to think clearly and critically about the leading political questions of our time. Miller first investigates how political philosophy tackles basic ethical questions such as 'how should we live together in society?' He furthermore looks at political authority, discusses the reasons society needs politics in the first place, explores the limitations of politics, and asks if there are areas of life that shouldn't be governed by politics. Moreover, he explores the connections between political authority and justice, a constant theme in political philosophy, and the ways in which social justice can be used to regulate rather than destroy a market economy. In his travels through this realm, Miller covers why nations are the natural units of government and wonders if the rise of multiculturalism and transnational co-operation will change all this, and asks in the end if we will ever see the formation of a world government.