För vad det är värt, det här är en gissning: Star Rangers av Andre Norton. Publiceras även under rubriken " Den sista planet " '.
A lone ship of the Stellar Patrol crash-lands on an out-of-the-way planet. Quickly scouting around, the crew find evidence of a long vanished hi-tech civilization in the Sealed Cities, along with nomadic hunter-gatherer level groups of humans. When the rangers enter one of the cities, they find it occupied by another group of refugees and ruled by the Acturian Cummi. A master telepath, bent on becoming the planet's sole ruler, Cummi is not above controlling other people's minds. Zinga, a member of the Zacathan race, along with the human Kartr, both higher-order telepaths themselves, end up in a fierce mental battle with Cummi. ~ Edited from Amazon.com
Obs! Du kan läsa boken i sin helhet här : -)