In 1879, a Canadian Blackfoot known as Spopee, or Turtle, shot and killed a white man. Captured as a fugitive, Spopee narrowly escaped execution, instead landing in an insane asylum in Washington, D.C., where he fell silent. Spopee thus "disappeared" for more than thirty years, until a delegation of American Blackfeet discovered him and, aided by the Commissioner of Indian Affairs, exacted a pardon from President Woodrow Wilson. After re-emerging into society like a modern-day Rip Van Winkle, Spopee spent the final year of his life on the Blackfeet Reservation in Montana, in a world that...