For the past five years—ever since a chance encounter at a dinner party—journalist Byron Tau has been piecing together a secret story: how the whole of the internet and every digital device in the world became a mechanism of intelligence, surveillance, and monitoring. Of course, our modern world is awash in surveillance. Most of us are dimly aware of this: Ever get the sense that an ad is “following” you around the internet? But the true potential of our phones, computers, homes, credit cards, and even the tires underneath our cars to reveal our habits and behavior would astonish most citizens. All of this surveillance has produced an extraordinary amount of valuable data about every one of us. That data is for sale—and the biggest customer is the U.S. government. In the years after 9/11, the U.S. government, working with scores of anonymous companies, many scattered across bland Northern Virginia suburbs, built a foreign and domestic surveillance apparatus of breathtaking scope—one that can peer into the lives of nearly everyone on the planet. This cottage industry of data brokers and government bureaucrats has one directive—“get everything you can”—and the result is a surreal world in which defense contractors have marketing subsidiaries and marketing companies have defense contractor subsidiaries. And the public knows virtually nothing about it. Sobering and revelatory, is the defining story of our dangerous grand bargain—ubiquitous cheap technology, but at what price?