Scorpion's tail

In the town of gold prospectors, lost among the mountains of New Mexico, a black prospector has been detained for attempting to extract mummified human remains. The investigation into the circumstances of the unknown person's death is entrusted to FBI special agent Corinne Svenson, who in turn seeks the help of archaeologist Nora Kelly. The appearance of the mummy indicates that this person died in terrible agony, and next to the body, an ancient gold cross adorned with precious stones is found. And if this treasure is from that legendary hoard hidden in the mountains by the Pueblo Indians during the Spanish colonization era? Only the dead knew the answer to this question... But who was he, will it be possible to establish his identity? Why do the remains emit strong radiation? There are clues, but the closer to the truth, the more strange deaths occur...