The buying and selling of citizenship has become a legitimate, thriving business in just a few years. Entrepreneurs are renouncing America and Europe in favor of tax havens in the Caribbean with the help of a cottage industry of lawyers, bankers, and consultants that specialize in expatriation. But as journalist Atossa Araxia Abrahamian discovered, the story of twenty-first century citizenship is bigger than millionaires buying their second or third passport. When she learned that mysterious middlemen had persuaded the Comoro Islands to turn to selling citizenship as a new source of revenue,...