In that hidden valley, land of strangely forbidding beauty, Eric Nelson,
soldier of fortune, faced a battle weirder and more savage than any he
had ever fought. He was hired to fight for humanity, against beings that
seemed to be both more and less than human.
The weapons of the enemy included centuries-old powers of magic and
superstition...but Nelson fought grimly, even when his mind was
helplessly trapped in the body of a wolf. Then came the climactic test
of his allegiance, the knowledge that more than just humanity was at
stake...and the final mind-shattering discovery of an alien secret that
lay buried in the Cavern of Creation!