Permeating all facets of public international law, the modern law of treaties is a fundamental aspect of governance in the ‘democratized’ world. In this contemporary introduction, Robert Kolb provides a refreshing study that is both legally analytical and practical. Written in a highly readable style, the book explores the key topics through concise chapters, which are organized into two parts. The first of these gives a structured overview of the law of treaties along with practical examples. The second provides a critical engagement with the underlying issues and discusses the multi-dimensional problems raised by legal regulations, explored through specific case studies.