Short, readable, crystal clear. Politics books are often a hard climb or at least a tedious trudge. This is a smooth glide by comparison.
Miller states at the start that he wants to avoid jargon and academic mumbo-jumbo and he does just that, taking us on a concise but enjoyable tour of political philosophy. He begins at first principles and gradually builds his arguments, with deftly chosen examples adding depth and colour to the text. The logical progression means that the focus is firmly on democracy (since that is the political system that makes most sense to most people nowadays). Although he presents (and knocks down) arguments for alternative systems, don't expect great forays into the pros and cons of ideologies like Communism or Fascism. Among the concepts he tackles are justice, social justice, freedom, multiculturalism, feminism and globalisation.
The thoughts of political philosophers such as Plato, Rousseau, Locke, Mill and Rawls are woven beautifully into the flow, compact nuggets that reinforce rather than halt the narrative. Anyone who has tried to trawl through Rawls in the original will whisper a quiet thankyou when they arrive at the digested wisdom of Miller's version.
Miller makes a promise at the outset and he sticks to it: to be scrupulously fair and present all sides of each argument, even if the reader doesn't share his own leanings (which I sensed were slightly leftward).
In sum, it would be hard to do better than this for a well-reasoned introduction to (or refresher course in) political philosophy.