On the planet Kregen that circles Antares, the brightest star of the Constellation of the Scorpion, two forces contend for the world's destiny.

Captive Scorpio [Dray Prescot #17]
Dray Prescot, Earthman of Kregen, that wonderful world circling the twin suns of Antares, had risen high in the empire of Vallia, but luck could not always sustain him. When, at last, all the forces opposed to his lands, his princess, his emperor, and to him personally, converged, it was to produce the darkest hour of his long career. For treason struck at the court, while rebel armies marched from the backlands, the war fleets of enemy nations were aloft, and the uncanny wizardry of a master scientist launched a spell of doom for all Prescot held dear. With his back to the wall, Dray Prescot faced that time of peril with unflinching will... until the cruelest blow of all was struck: his warrior daughter Dayra rode in the vanguard of his foes!

Golden Scorpio [Dray Prescot #18]
Book eighteen in the saga of Dray Prescot. When you're down there's no place to go but up. That's the way the brave think and if there is anyone on two worlds braver than Dray Prescot, he has yet to appear. Prescot, who had been a seaman and soldier on distant Earth, and now, on Golden Scorpio's fabulous planet, was claiment to the fallen throne of a conquered empire, would never give up. Single-handedly, if need be, he would be a deadly threat to the enemies of Vallia. But as he set out on a liberation mission incomparable in the history of two worlds he knew he would never be alone...

Savage Scorpio [Dray Prescot #16]
Somewhere in the unmapped regions of Kregen, beneath the two suns of Antares, alpha star of the Constellation Scorpio, lies the hidden city of the Savanti. The Savanti were the ones responsible for tearing Dray Prescot away from his native Earth for their struggle against the Star Lords. And Dray had long sought the locale of his original landing because it would help solve the mystery of his transition. Now the time had come when the search must be completed without delay, for the father of his beloved Delia was a victim of assassins, and only the Savanti could undo the evil that could shatter all that Dray held dear in his second planetary homeland. Savage Scorpio is the thrilling novel of a mission that would involve powerful forces far beyond all Prescot's personal desires.

Secret Scorpio [Dray Prescot #15]
The brightest star in the Constellation Scorpio is the brilliant double sun Antares, around which orbits the inhabited planet called Kregen. Kregen is an Earthlike world, but strange, far stranger, than ours. For it is the scene of a conflict between galactic powers who utilize its many human nations and its astonishing variety of humanoid peoples as their battleground. Dray Prescot of Earth had been a tool of those powers, but courage and ingenuity had won him a high role in the Vallian Empire and a certain independence of his own. Thus when a mysterious monster cult began to undermine the empire and when his own beloved princess became a victim of those secret schemers, Prescot had to go into action. Secret Scorpio launches a new cycle in the magnificent history of Kregen and brings Prescot at long last into direct confrontation with the forces that had once dared make him their pawn.