Pirates of the desert

the long version

"The locals call the sand dunes of the Arizona Territory southland a white ocean. One man, Barney Shivers, carries the comparison a little further when he decides to monopolize the shipping industry. Ordering his men to attack any freight shipping that he does not control, goods are stolen and held to ransom on the high seas. No one dares to fight back until one little old lady Lolly Amos, stands up to the bully. When the local law refuses to help, Lolly contacts her nephew, Captain Parthenon Downs of the Arizona Rangers. Restless to leave his desk duty behind, Captain Downs eagerly takes on the challenge. Little does he realize that his decision will draw him into a war against two bands of pirates, and a young woman with a Winchester rifle ..."--Publisher description.