Hidden beneath the shifting sands of the Nevada desert, the Lost Buckaroo mine has become a near-legend. Then a man claims to have found it - and dies under outlaw guns. Range detectives Rainbow Ripley and Grumpy Gibbs join forces with Meilang, a beautiful, mysterious Chinese- American girl. They bait a trap and begin a long desert trek. Danger dogs their trail, but the trio finds a powder smoke solution in the twisting desert cañons near the Lost Buckaroo.