The introduction sets out the general context, motivation, and contribution of the book. It describes its three-fold purpose: to collect insider accounts of high-level delegates, to analyse the factors that shaped the negotiations, and to identify practical lessons learned. It argues that the book makes signicant contributions to the academic literature, extending our understanding of multilateral negotiations, not only relating to the Paris Agreement, but to other climate negotiations and multilateral negotiations more generally. The chapter also discusses key practical lessons, describes the structure of the book, and provides short summaries of the individual chapters.