How should a judge's moral convictions bear on his judgments about what the law is? In his new book, Ronald Dworkin argues that the question is much more complex than it has often been taken to be and charts a variety of dimensions - semantic, jurisprudential, and doctrinal - in which law and morals are undoubtedly interwoven. Dworkin's new collection of essays and original chapters is a model of lucid, logical, and impassioned reasoning that will advance the crucially important debate about the roles of justice in law.