Spider Moon

A young journalist is given an assignment to verify the existence of a very large man-eating spider roaming the Amazon jungle. Along with his Peruvian guide, the journalist encounters the fearsome and rarely encountered Toromona tribe deep in the Amazon jungle, and together they are invited by the tribe's Chieftain to accompany two village huntsmen in the search for a murderous tarantula-like spider.
The Toromona refer to the maurading spider as Ah-bee-too, and are protected against the creature's deadly attacks by the powerful forces inherent in a gold crescent necklace that was handed down to them for many generations, and could only be worn by the tribe's shaman.
The journalist's Peruvian guide has his eye on the heavy solid gold necklace and sees an opportunity for quick riches.