In the 1980s, the tiny Pacific island of Nauru was the wealthiest nation on Earth per capita. Today, it’s a bankrupt, ecological wasteland that sold its soul to the Russian underworld. We uncover the $70 billion money-laundering scheme orchestrated from a single wooden post office box, the catastrophic Wall Street loophole that made it possible, and the tragic downfall of a nation that quite literally mined itself out of existence.