The green man was hurrying his captive toward a huge thoat that browsed upon the ochre vegetation of the once scarlet-gorgeous plaza. At the same instant a dozen red warriors leaped from the entrance of a nearby ersite palace, pursuing the abductor with naked swords and shouts of rageful warning.

Once the woman turned her face upward toward the falling flier, and in the single swift glance Carthoris saw that it was Thuvia of Ptarth!

When the light of day broke upon the little craft to whose deck the Princess of Ptarth had been snatched from her father's garden, Thuvia saw that the night had wrought a change in her abductors.

No longer did their trappings gleam with the metal of Dusar, but instead there was emblazoned there the insignia of the Prince of Helium.

The girl felt renewed hope, for she could not believe that in the heart of Carthoris could lie intent to harm her.

She spoke to the warrior squatting before the control board.

«Last night you wore the trappings of a Dusarian,» she said. «Now your metal is that of Helium. What means it?»

The man looked at her with a grin.

«The Prince of Helium is no fool,» he said.

Just then an officer emerged from the tiny cabin. He reprimanded the warrior for conversing with the prisoner, nor would he himself reply to any of her inquiries.

No harm was offered her during the journey, and so they came at last to their destination with the girl no wiser as to her abductors or their purpose than at first.

Here the flier settled slowly into the plaza of one of those mute monuments of Mars' dead and forgotten past-the deserted cities that fringe the sad ochre sea-bottoms where once rolled the mighty floods upon whose bosoms moved the maritime commerce of the peoples that are gone for ever.

Thuvia of Ptarth was no stranger to such places. During her wanderings in search of the River Iss, that time she had set out upon what, for countless ages, had been the last, long pilgrimage of Martians, toward the Valley Dor, where lies the Lost Sea of Korus, she had encountered several of these sad reminders of the greatness and the glory of ancient Barsoom.

And again, during her flight from the temples of the Holy Therns with Tars Tarkas, Jeddak of Thark, she had seen them, with their weird and ghostly inmates, the great white apes of Barsoom.

She knew, too, that many of them were used now by the nomadic tribes of green men, but that among them all was no city that the red men did not shun, for without exception they stood amidst vast, waterless tracts, unsuited for the continued sustenance of the dominant race of Martians.

Why, then, should they be bringing her to such a place? There was but a single answer. Such was the nature of their work that they must needs seek the seclusion that a dead city afforded. The girl trembled at thought of her plight.

For two days her captors kept her within a huge palace that even in decay reflected the splendour of the age which its youth had known.

Just before dawn on the third day she had been aroused by the voices of two of her abductors.

«He should be here by dawn,» one was saying. «Have her in readiness upon the plaza-else he will never land. The moment he finds that he is in a strange country he will turn about-methinks the prince's plan is weak in this one spot.»

«There was no other way,» replied the other. «It is wondrous work to get them both here at all, and even if we do not succeed in luring him to the ground, we shall have accomplished much.»

Just then the speaker caught the eyes of Thuvia upon him, revealed by the quick-moving patch of light cast by Thuria in her mad race through the heavens.

With a quick sign to the other, he ceased speaking, and advancing toward the girl, motioned her to rise. Then he led her out into the night toward the centre of the great plaza.

«Stand here,» he commanded, «until we come for you. We shall be watching, and should you attempt to escape it will go ill with you-much worse than death. Such are the prince's orders.»

Then he turned and retraced his steps toward the palace, leaving her alone in the midst of the unseen terrors of the haunted city, for in truth these places are haunted in the belief of many Martians who still cling to an ancient superstition which teaches that the spirits of Holy Therns who die before their allotted one thousand years, pass, on occasions, into the bodies of the great white apes.

To Thuvia, however, the real danger of attack by one of these ferocious, manlike beasts was quite sufficient. She no longer believed in the weird soul transmigration that the therns had taught her before she was rescued from their clutches by John Carter; but she well knew the horrid fate that awaited her should one of the terrible beasts chance to spy her during its nocturnal prowlings.

What was that?

Surely she could not be mistaken. Something had moved, stealthily, in the shadow of one of the great monoliths that line the avenue where it entered the plaza opposite her!

Thar Ban, jed among the hordes of Torquas, rode swiftly across the ochre vegetation of the dead sea-bottom toward the ruins of ancient Aaanthor.

He had ridden far that night, and fast, for he had but come from the despoiling of the incubator of a neighbouring green horde with which the hordes of Torquas were perpetually warring.

His giant thoat was far from jaded, yet it would be well, thought Thar Ban, to permit him to graze upon the ochre moss which grows to greater height within the protected courtyards of deserted cities, where the soil is richer than on the sea-bottoms, and the plants partly shaded from the sun during the cloudless Martian day.

Within the tiny stems of this dry-seeming plant is sufficient moisture for the needs of the huge bodies of the mighty thoats, which can exist for months without water, and for days without even the slight moisture which the ochre moss contains.

As Thar Ban rode noiselessly up the broad avenue which leads from the quays of Aaanthor to the great central plaza, he and his mount might have been mistaken for spectres from a world of dreams, so grotesque the man and beast, so soundless the great thoat's padded, nailless feet upon the moss-grown flagging of the ancient pavement.

The man was a splendid specimen of his race. Fully fifteen feet towered his great height from sole to pate. The moonlight glistened against his glossy green hide, sparkling the jewels of his heavy harness and the ornaments that weighted his four muscular arms, while the upcurving tusks that protruded from his lower jaw gleamed white and terrible.

At the side of his thoat were slung his long radium rifle and his great, forty-foot, metal-shod spear, while from his own harness depended his long-sword and his short-sword, as well as his lesser weapons.

His protruding eyes and antennae-like ears were turning constantly hither and thither, for Thar Ban was yet in the country of the enemy, and, too, there was always the menace of the great white apes, which, John Carter was wont to say, are the only creatures that can arouse in the breasts of these fierce denizens of the dead sea-bottoms even the remotest semblance of fear.

As the rider neared the plaza, he reined suddenly in. His slender, tubular ears pointed rigidly forward. An unwonted sound had reached them. Voices! And where there were voices, outside of Torquas, there, too, were enemies. All the world of wide Barsoom contained naught but enemies for the fierce Torquasians.

Thar Ban dismounted. Keeping in the shadows of the great monoliths that line the Avenue of Quays of sleeping Aaanthor, he approached the plaza. Directly behind him, as a hound at heel, came the slate-grey thoat, his white belly shadowed by his barrel, his vivid yellow feet merging into the yellow of the moss beneath them.