Natural Law and Natural Rights is a refreshingly direct book about some decidedly difficult matters. It is also a book that refuses to do homage to the complexity of its subject by limiting the topics covered. Here is virtually a mini-treatise in moral philosophy, with illuminating discussions on the whole range of human value and on a good part of the related range of metaethics, legal theory, political theory, and the problems of methodology in the descriptive social sciences.
Soper, E. Philip. "Legal Theory and the Problem of Definition." Review of Natural Law and Natural Rights, University of Chicago Law Review 50 (1983): 1170-1200.