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

Armada of Antares [Dray Prescot #11]
Kregen! That marvelous world circling the double-star Antares in the Constellation Scorpio has been the scene of many an exciting event as its myriad human and non-human races struggle with each other for ascendency. But for Dray Prescot, Earthman and Prince of Vallia, all of the electrifying aspects of his adventurous life on Kregen were to climax when the armies of Havilfar made their move toward his adopted homeland before he had fully solved the secret of their mysterious air fleets Armada of Antares is the culmination of all his experiences on Kregen so far -- a peril-pitched novel, complete in itself, of an alien world stirred up to a life-or-death frenzy.

Krozair of Kregen [Dray Prescot #14]
Never before in his fantastic career on Kregen, planet of the twin suns of Antares, had Dray Prescot been in such a desperate predicament. A despised outcast by his friends who wore the red of Zair, he had now been condemned by his old enemies whose battle color was the green of the sun Grodno. For while among these slavers and conquerors of the green, searching for a way to turn the tide of war to his own redemption and his friends' advantage, he had personally encountered the deadly animosity of Grodno's king, had betrayed his champion, and had shattered all he had so carefully worked for. But continue he must, for now, in addition to the enormous feat that alone would restore his honor, he had a blood vengeance to achieve that overrode everything.

Renegade of Kregen [Dray Prescot #13]
Never before in his adventurous career under the double suns of Antares had Dray Prescot been in as desperate a situation as he found himself on his second entry into the city of Magdag. Magdag had been the scene of one of Prescot's earliest experiences on Kregen and he recalled it with loathing as a city of power-lusting slavers, of decadent worshippers of the Green Sun. As one who had been initiated into the chivalric order of Krozairs, he despised all that that city stood for. But now Prescot was an outcast. Any Krozair, any follower of the Red Sun of his former friends, would slay him on sight. For him there was only one way to recover his home, his children, his self-respect. He would have to perform an act of valor so extreme, so fabulous, that its glory would wash away all that now stained his name. Only by reaching to the very heart of mighty Magdag could he hope to achieve such a suicidal triumph.

Tides of Kregen [Dray Prescot #12]
Of all the honours that Dray Prescot, Earthman, had won during his fabulous adventures on Kregen, none were valued by him more than his membership in the Order of the Krozairs of Zy. The Krozairs are the highest order of chivalry on that turbulent planet, dedicated men, warriors of stern convictions and unflinching hearts. And Prescot had been ordained a Krozair back at the dawn of his career. Thus when the Krozairs in their hour of need called on all their far-flung members for aid, he should have gone. But he could not. His return from Earth was blocked by the anger of the mysterious Star Lords. Before Dray Prescot could achieve redemption, he had two armies opposed to him, two warring kingdoms naming him outlaw, and only the tides of the seven moons as a weapon...