Guest Stars Toby Jones as Samuel Ratchett Hugh Bonneville as Edward Masterman Denis Ménochet as Pierre Michel David Morrissey as John Arbuthnot Brian J. Smith as Hector MacQueen Samuel West as Dr. Constantine Jessica Chastain as Mary Debenham Barbara Hershey as Caroline Hubbard Eileen Atkins as Princess Dragomiroff Marie-Josée Croze as Greta Ohlsson Sam Crane as Lt. Blanchflower Serge Hazanavicius as Xavier Bouc Tristan Shepherd as Lt. Morris Susanne Lothar as Hildegarde Schmidt
