Since 2011, the conflict in Syria has been one of the most catastrophic conflicts of our time and a dark stain on the peacemaking abilities of the United Nations (UN). At the heart of this book is a simple but critical question – what do UN mediators tasked with the responsibility to make peace actually do? By explaining this, the book offers a detailed record of what Kofi Annan, Lakhdar Brahimi, and Staffan de Mistura did in their roles as UN mediators in Syria and presents a comprehensive analysis of the dynamics that shaped their decision-making. Beyond the cases of these three mediators, Fadi Nicholas Nassar introduces a method by which to forensically identify a mediator's fingerprints on the peacemaking process and charts a map to examine their decision-making processes. In doing so, it paves the way to evaluate the performance of these mediators – to hold them accountable for their successes and failures.