Railroad bull Hook Runyon and his dog, Mixer, are chasing persistent pickpockets on the Santa Fe line, when Hook is called to investigate a malfunctioning wigwag signal in the middle of nowhere. A young man has been strung up there, hung from the signal, and left strangled to death. Hook finds no identification on the body, other than a bronze hero's medal around the corpse's neck, with the name Samuel Ash engraved on it. Refusing to bury what seems...