The book "Trillions" by Robin Wigglesworth is a comprehensive examination of the history and current state of the global asset management industry. In the book, Wigglesworth provides a detailed analysis of the various actors, trends, and strategies that have shaped the asset management industry into the behemoth it is today.

Wigglesworth explores the rise of passive investing, the increasing dominance of exchange-traded funds (ETFs), and the ongoing evolution of the industry in response to technological innovation and regulatory changes. He also delves into the ethical and social implications of the massive sums of money being managed by the industry and the potential risks and challenges that may arise as a result.

Overall, "Trillions" provides a fascinating and insightful look into the complex and influential world of asset management, offering both a historical perspective and a glimpse into the industry's future.