Zane Grey's Stories of the West #30

Uncle died, young Iowan Ernest Selby inherits the ranch in Arizona, where twenty thousand cattle have become only six thousand. To investigate, Ernest goes undercover, hiring on at his own ranch, as a greenhorn dude. He makes allies, enemies, and courts the thief foreman's daughter, Anne Hepford. Selby takes to cowboy life, persists in his investigation, and befriends Miss Hepford in her distress.