While writing a biography of his famous namesake, Bill Lewis, a high-school history teacher, nearly loses himself in his attempts to understand one of the great untold stories in American history—the adventures and subsequent suicide of Meriwether Lewis. Even as he struggles to illuminate that strange and exuberant time and and falls under the spell of the elusively seductive persona of Capt. Lewis, Bill finds himself fighting his own personal crisis, brought on by a clinical depression...