In the fall of 1955, Bernard Cornfeld arrived in Paris with scant money in his pocket and a tenuous relationship with a New York firm to sell mutual funds overseas. Cornfeld, a former psychologist and social worker, knew how to make friends fast and soon targeted two groups of people who could help him fulfill his economic ambitions: American expatriates who were looking to build their own fortunes and servicemen abroad who loved to live high-rolling lives and spend money. Using the first group as door-to-door salesmen and the second group as his gullible target, Cornfeld built a...