Web of Sand: The Dumarest Saga Book 20

There was only one way out of Harge: to find a singing jewel, the greatest prize on that world of sand dunes. But the jewels were hidden deep in the burrows of Harge's most vicious predator. Earl Dumarest could fight humans, could match wits with the implacable Cyclan. But now, in his galaxy-spanning quest for the lost planet Earth, he must face the WEB OF SAND. (First published 1979)