Priest-Kings of Gor (Chronicles of Counter Earth, Volume 3)

In which Tarl Cabot, Tarnsman of Gor, sets out to discover the true nature of the Priest-Kings who rule Gor with an iron and absolute discipline. No one knows what the Priest-Kings are-- whether alien or supermen. None have ever returned from the mountains of Sardar, traditional stronghold of the merciless rulers of Gor. Now Tarl himself is on the verge of entering Sardar.