It is January of 1872, and Grand Duke Alexei Alexandrovich, son of the Tsar of Russia, is touring America. Ethan and his adopted daughter, Angel, stumble onto and thwart an assassination attempt on the Grand Duke. This earns them his favor, and they join the Grand Duke's party for the rest of the tour as bodyguards, working for an old friend from the war, Silas Riddle, The Mechanic. Their job takes them to Nebraska with the young duke to hunt buffalo,...