An undated handout shows the cover of "Across the Endless River," a book by author Thad Carhart. Carhart found the real-life story of Jean-Baptiste Charbonneau so riveting and improbable that he wrote a novel about it. "Across the Endless River," is set in the vastly different worlds Charbonneau inhabited -- the rough and ready U.S. frontier of the early 19th century and an aristocratic Europe recovering from Napoleon's wars. Reuters Pictures logo Reuters Pictures 28 months ago

An undated handout shows the cover of "Across the Endless River," a book by author Thad Carhart. Carhart found the real-life story of Jean-Baptiste Charbonneau so riveting and improbable that he wrote a novel about it. "Across the Endless River," is set in the vastly different worlds Charbonneau inhabited -- the rough and ready U.S. frontier of the early 19th century and an aristocratic Europe recovering from Napoleon's wars.