Governments are rightly discussing reform of investment treaties, and of the powerful system of ‘investor–state dispute settlement’ (ISDS) upon which they rest. It is therefore important to be clear about the crux of the problem. ISDS treaties are flawed fundamentally because they firmly institute wealth-based inequality under international law. That is, they use cross-border ownership of assets, mostly by multinationals and billionaires, as the gateway to extraordinary protections, while denying equivalent safeguards to those who lack the wealth required to qualify as foreign investors. The treaties thus have the main effect of safeguarding an awe-inspiring set of rights and privileges for the ultra-wealthy at the expense of countries and their populations. This book shows how ISDS came to explode in a global context of extreme concentration of wealth and of widespread poverty. The history of early ISDS treaties is highlighted to show their ties to decolonization and, sometimes, extreme violence and authoritarianism. Focusing on early ISDS lawsuits and rulings reveals how a small group of lawyers and arbitrators worked to create the legal foundations for massive growth of ISDS since 2000. ISDS-based protections are examined in detail to demonstrate how they give exceptional advantages to the wealthy. Examples are offered of how the protections have been used to reconfigure state decision making and shift sovereign minds in favour of foreign investors. Finally, the ongoing efforts of governments to reform ISDS are surveyed, with a call to go further or, even better, to withdraw from the treaties.