Adopting a mixed-methods approach, this book assesses the role of soft law as a technique to repress and prevent money laundering. The consequence of the combination of a non-traditional subject matter with the limitations of traditional international law instruments has meant that lawmakers seeking international solutions to the problems of money laundering have had to innovate. This book addresses two fundamental issues in the context of existing international and domestic responses to the problem of money laundering that have hitherto been neglected. These include the nature of the treaty obligations to criminalise money laundering, and the role of soft law as a technique to regulate it globally. The book concludes that international legal harmonisation and approximation of domestic anti-money laundering law through soft law remains helpful in addressing this pressing problem. The book will be of interest to academics, researchers, and policy-makers working in the areas of Financial Crime, Anti-Money Laundering Law, Regulation, International Soft Law, and Comparative Law.