Book excerpt: A compelling study of the interaction between regional agencies and the UN Security Council that includes a proposal for a regional-global security mechanism, which should be of interest to policy makers worldwide. This ground-breaking exploration into how peace and security might best be attained in the 21st century, its central message is the importance of realizing UN Secretary-General Kofi Annan's vision of a "regional-global security mechanism" within the next decade. The book reviews the historical tussle between universalism and regionalism as the cornerstone of international security over the past century, culminating in the "new regionalism" that has characterised international relations in recent decades. The complexities of contemporary regional, sub-regional and other organizations, blessed and burdened with overlapping membership, evolving mandates, and even shifting "focal areas" are analysed. The "multidimensional phenomenon" of regional security is explored--cultural, political and legal--with a view to understanding how regional organizations work today. This book is one of those rare offerings--a policy-oriented prescription for peace and security that is based on factual analysis and creative reasoning. It is a must for national diplomats, regional officials, and international civil servants.