Aaron Burr remains one of the most darkly compelling figures in early United States history. Best known as the man who killed Alexander Hamilton in a duel at Weehawken, New Jersey, Burr served as a U.S. senator and as Thomas Jefferson's vice president from 1800 to 1804. Before that, he gained a national reputation as a brilliant attorney. In the first popular book to focus on one of the most intriguing chapters in Burr's long life, historian Buckner...