This book offers a clear account of the philosophy of practical reason in ethics and legal theory. It explains how reasons relate to actions, the nature of values and their relation to reasons, and the relation of morality to legal reasoning. It provides an ideal introduction to these issues for students of moral philosophy and jurisprudence. ...deserves a wider reading and could change the picture of legal positivism nowadays. It could be the case not only because of the valuable new insight into the old problems invoked in philosophical thoughts achieved by means of dialogue with the contemporary context of legal theory, but also because of the deepness, reflective and proactively original insight presented in MacComick's last book. I strongly recommend this book to every lawyer.