International trade deals have become vastly complex documents, seeking to govern everything from labor rights to environmental protections. This evolution has drawn alarm from American voters, but their suspicions are often vague.

In this book, investigative journalist Haley Sweetland Edwards focuses on one crucial aspect of these massive agreements: a powerful provision called Investor-State Dispute Settlement, which allows foreign corporations to sue sovereign nations before little-known supranational arbitration tribunals.

Edwards makes a devastating case that these tribunals (the "shadow courts" of the book's title), which were designed 50 years ago to protect foreign investors' property rights abroad, are now being exploited by multinational corporations at the expense of sovereign nations and their citizens. From the 1960s to 2000, corporations brought fewer than 40 cases through these tribunals. In the last 15 years, they've brought nearly 650.

In the course of her reporting, Edwards interviewed dozens of policymakers, activists, and government officials in Argentina, Canada, Bolivia, Ecuador, the European Union, and the United States. The result is a major story, untold before now, about a significant shift in the global balance of power.