Notes
Part 11 of The Chronicles of Counter-Earth series.

Reissued by Star in 1980, 1982 and 1985, all with the same cover.

Publisher’s Blurb – Lower Cover
Tarl Cabot had resumed his allegiance to the Priest-Kings, the benevolent rulers of Earth's twin planet, Gor. And accordingly Tarl knew that the battle for the possession of the planet was under way – the Kurii, the beastlike invaders, had made their plans.

There was a girl, once of Earth, found in the wilderness of Gor. Captured, as such lovely strangers were on that ruthless world, she was to undergo the training that would make of her a slave of great value. But unknown to her captors, she was a tool of the Kurii and carried a programmed message that imperilled the future of Gor. It was for possession of her mind and body that Priest-King and Kur-monster battled, while few knew that a planet's fate was also locked within the slave collar that bound her neck.