Deep in the forbidding Arizona desert lies the secret of the many mysterious disappearances of people who have braved the area – the slave camps of Barbara Dickinson. Her slaves work a rich silver mine long thought to be only a legend. But for those who toil under the sadistic yoke of this madwoman the mines are a brutal reality.

Into this hellish realm of cruelty and madness comes Cuchillo Oro. Close on the trail of his arch enemy, Captain Pinner, the Apache warrior is captured by Barbara Dickinson’s hired Mexican desperadoes.