The Pnume (Planet of Adventure, Vol. 4)

"The Pnume were an ancient race of the planet Tschai, living underground in a vast network of caverns with their human slave-species, the Pnumekin. The Pnume were the historians of Tschai collecting its past with scholarly disinterest. Surface-dwellers never saw the Pnume, if the surface-dwellers were lucky. Adam Reith was not so fortunate. The Pnume had heard rumors of a strange man, claiming to come from the planet Earth, and they needed him for Foreverness, the museum of Tschai life. Adam Reith was about to become an alien exhibit."--Pg. [4] of cover.