Returning from the war, Buck finds his younger brother in trouble; while trailing him he gets caught by Murdock, who takes his letter of introduction to the Del Rays. Posing as Buck, Murdock takes Del Ray’s jewels–and his most precious one, his daughter Juanita. To arrange Murdock’s capture and rescue Juanita, Buck now poses as Murdock. More on Wikipedia or Mubi
Watch Men Without Law (1930)