Iduna's Universe — E.C. Tubb

It was touch and go for Earl Dumarest when the slavers of the Matriarchy of Onorldi struck his work camp. Had he not captured the Matriarch herself during the fight, it might have spelled his doom when the slavers triumphed.

Because even though the odds had turned heavily against him, he was able to strike a bargain. The Matriarch's child daughter, Iduna, had disappeared into the mind-trap of the Tau. If he could follow, find her, and return with her, he would have his freedom and a chance to locate the lost Earth he sought.

So it was into Iduna's private universe he went -- the creation of the Tau under the whims and fancies of a restless and spoiled planetary princess. To escape, Dumarest had to outwit her monster playthings, outfight her hideous horrors, and outdream her satanic fantasies....