This chapter provides an overview of the aims and research questions guiding this book. It introduces key terms and concepts and outlines the main contributions of the book. The chapter explains why the complex relations between state and non-state actors are crucial to understanding the implementation of the Paris Agreement. It provides a background to understanding the role of collaborative climate governance in the post-Paris governance landscape by highlighting the international context and describing Sweden’s climate policy framework. Finally, it provides a brief overview of each chapter in the book.