Deep beneath our feet, vast and sprawling, lies one of the most sophisticated empires the world has ever known. At first glance, it might not look like much - it is made up of fibre optic cables and obscure payment systems. But according to prominent political scientists Henry Farrell and Abraham Newman, the United States has turned the most vital pathways of the world economy into tools of domination over foreign businesses and countries, whether they are rivals or allies, allowing it to maintain global supremacy. Drawing on original reporting and ground-breaking research, Farrell and Newman explain how this underground empire has allowed the United States to eavesdrop on other countries and isolate its enemies. Now, efforts by countries such as China and Russia to untether themselves from this coercive US-led system are turning the global economy into a battle zone.