Aaron Burr--Revolutionary War hero, third vice president of the United States and a controversial figure of the early republic--was tried and acquitted of treason charges in 1807, and thereafter departed for self-imposed exile in Europe, his political career in ruins. Adrift in Paris for 15 months, he led a marginal existence on the run from creditors and the courts, getting by on handouts. While other Americans in Paris enjoyed official status that insulated them from life in the capital, Burr dreamed up fruitless schemes and pawned his possessions, yet remained in high spirits, enjoying...