This book is a sophisticated, detailed, and original examination of the main ideas that have dominated Anglo-American legal philosophy since the Second World War. The author probes such themes as: whether there can be right answers to all disputed law cases; how laws and other rules impact on the practical rationality of actors subject to their authority; whether general principles justifying the law must themselves be thought of as part of the law binding on legal actors; and the possibility of an interpretivist jurisprudence that is continuous with law practice in a given culture.