The central argument of this study is that the universal phenomenon of friendship provides us with an inter-subjectively agreeable and rich conception of justice that can be transposed to the context of law. While presented as a theory of law, the work considers and traverses the fields of jurisprudence, tort law, contract law, philosophy, ethics and political theory. In dealing with substantive areas of law, the book draws upon cases from the United States, England, and the Commonwealth.