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Cowboy Bob Blake (Herbert Jeffries) and four friends ride to Arizona to help Betty Jackson (Artie Young), the sister of Bob's friend, Joe (Rollie Hardin), who has gone missing. Bob meets the Jacksons' neighbor, Buck Thorn (Clarence Brooks), who says that he'd offered to buy the Jackson ranch but was rejected. Unknown to Bob and his friends, Thorn holds Joe hostage to torture him into signing over his property, which hides a valuable mine. When Betty then disappears, Bob decides to take on Thorn. Wikipedia