This introductory chapter explains the motivation behind the book. It argues that it is unhelpful to talk about what labour law should be doing, and how, without a deeper understanding both of what law is, its ontology, and the nature of the society to which it is specific. The chapter introduces key themes and ideas, and outlines, briefly, the chapters to follow. It introduces the reader to social ontology, and the particular approach to social ontology inspiring the book. It contrasts two competing conceptions of the law–market and law–society relationship, and explains how these conceptions influence assumptions about the nature, and function, of labour law, and of the concept of the wage.