This book challenges how we think about the foundations and boundaries of criminalisation by reimagining the concepts of public goods and legal interests—both nationally and transnationally. Can we identify common public goods and legal interests across borders that warrant protection through criminal law, or are they shaped by diverse national values and principles? To answer this, the book examines how these concepts justify, explain, and constrain the criminalisation of conduct across different legal systems. It blends rigorous academic analysis with practical recommendations to help further shape our ideas on criminalisation and the future of criminal law, making it a must-read for scholars, practitioners, and anyone invested in the future of criminal justice across Europe and beyond.