F.A. Hayek 
Law, Legislation and Liberty [PDF ebook] 
A New Statement of the Liberal Principles of Justice and Political Economy

Combines all three volumes of Hayek’s comprehensive study of the basic principles of the political order of free society: Rules and Order, The Mirage of Social Justice and The Political Order of a Free Society. ‘A careful and brilliant statement of the conditions of human freedom. It is a major work of political and economic philosophy which sets terms that neither its friends or critics can ignore.’ – THES