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 Chinese-American girl. They begin a long desert trek. The trio find a powder smoke solution in the twisting desert canyons near the Lost Buckaroo.