Mazes of Scorpio [Dray Prescot #27‪]‬

Beneath the emerald and ruby glow of the double suns of Antares lies a marvelous and brilliant world of savagery and beauty. The planet Kregen, where Dray Prescot, Earthman agent of the superhuman Star Lords struggles to bring peace to the world which has become his home. But although his nemesis, the mad empress of Hamal, and her accomplice, the evil Wizard of Loh have been destroyed, Prescot finds that the strands of this enduring battle have not been tied off, for an old conspiracy has been given a new and darker impetus which leads him to the jungle continent of Pandahem, where beneath the dark and sweltering swamps lies the deadly labyrinth of the Coup Blag where Prescot clashes with a new and terrible foe in the mazes of Scorpio!