Longarm and the one-armed bandit

About “Longarm and the one-armed bandit”

Deputy U.S. Marshal Custis Long is sent to El Paso to break up a smuggling ring dealing in Chinese laborers, going undercover as Nathan James to catch the smugglers crossing the Rio Grande. He is befriended by a brother and sister, and the one-armed brother wants him to help with a bank robbery south of the border.