
This didn’t just threaten Oesterlund’s fortune. It also had the potential to carve open a portal into the world of offshore finance, a place that the global elite has spent hundreds of millions of dollars to build and defend. In the offshore archipelago, their interests are hidden behind shell companies and trusts, their anonymity guaranteed under the law, from Delaware to the Bahamas to the South Pacific. James S. Henry, a former chief economist at McKinsey, calls the offshore financial world the “economic equivalent of an astrophysical black hole,” holding at least $21 trillion of the world’s financial wealth, more than the gross domestic product of the United States.