Hoping to recover buried childhood memories, Monte Segundo visits the graves of his murdered parents. There he discovers Ahayaca, a fugitive being pursued by Mexican rurales. Segundo helps Ahayaca flee to a village near Tucson. With the rurales close behind, Monte and Ahayaca then head south to Sasabe, Arizona. The rurales, believing Ahayaca knows the location of the lost Tayopa mine, join forces with an arms dealer and cattle rustler. They trail Monte and Ahayaca to Ahayaca's village, the home of a secretive tribe that fled Mexico four centuries earlier. But the rurales and arms dealer soon discover that these Indians are like none they have ever encountered before.