Jan Narveson is one of the most significant contemporary defenders of the libertarian political position. Unlike other libertarians who typically defend their view with reference to natural rights or an appeal to utilitarianism, Narveson's main contribution has been to offer a philosophical defence of libertarianism based on a Hobbesian individualist contractarian ethic. Critiques of Narveson's contractarian libertarianism fall into three categories, those that reject contractarian moral theory, those that reject any link between contractarianism and libertarianism and those that accuse libertarians of conflating liberty with property. In this book Malcolm Murray brings together the most significant of Narveson's critics and presents their work alongside replies by Jan Narveson.