This text investigates the historical development, structural transformation, and ongoing legal challenges facing the European Union's legal order. Authors Gráinne de Búrca and Paul Craig, both distinguished scholars in the field of European law, synthesize decades of case law, treaty revisions, and institutional shifts. They provide a comprehensive framework for understanding how the EU has evolved from a series of economic agreements into a complex, quasi-constitutional legal system.

Legal scholars and practitioners frequently cite this work as a foundational text for understanding the complexities of the European legal order. The prose is noted for its academic rigor and its ability to clarify the intricate interplay between supranational authority and member state sovereignty.