In this major reinterpretation and contemporary defence of Mill's political philosophy, Riley offers a new reading of Mill's radical doctrine that is quite distinct from the prevalent and vague understanding of the term 'liberalism'. Based on the argument of On Liberty, the book begins by indicating the current debates about Mill's liberalism, followed by a summary of the argument, and an exploration of the alternative forms of liberalism that have since emerged, such as the doctrines of Green, Bosanquet and Berlin. Riley then provides a full reinterpretation of Mill's doctrine covering issues of social custom and behaviour, and recent claims about Millian application on cases of pornography and prostitution. This fascinating investigation of one of the most controversial doctrines in philosophy is essential reading for students of Mill and political philosophy, and for those interested in the concept of liberty and its application.