"You are very strong, are you not?" she asked.

"Yes."

"Then you will have no trouble in following us up the cliff. Our Serpent G.o.d, Quetzalcoatl, taught us how to climb long ago."

With that she handed Kirby the set of vacuum discs, and producing another for herself, moistened them in a pool of water close at hand.

Then, as all of the girls followed her action, she strapped them to her hands and feet, and in a moment they had begun the ascent.

"Why," Kirby said presently, "with these things you could hang by your feet and walk on a smooth ceiling!"

Naida laughed, and they worked their way upward.

When the climb was accomplished and the discs were put away, Kirby found himself standing on the outer edge of a mediaeval paradise, of a magnificent plateau partly fortified by nature, partly by the hand of man.

"Ah!" he cried in deep admiration, then followed Naida.

The building--the castle--in the near distance, resembled a castle of Spain, save that there was greater beauty and subtlety of architecture.

Turreted on all four corners, constructed of material which looked like blocks of natural gla.s.s, the fairylike structure was crowned by a gigantic tower of something which resembled obsidian. Up and up this tower soared until its gleaming black tip seemed almost to touch the gla.s.sy-radiant sky of the cavern.

No people showed themselves, and Kirby saw that the bronze-studded portals set in the front of the castle were closed.

Admiringly, he glanced at the surrounding land laid out in checkerboard patches of gardens and orchards where grew a bewildering variety of unknown fruits and blooms. b.u.t.terflies drifted past, and the air was freighted with the scent of flowers. Inside a walled enclosure, Kirby saw a good-sized plot heavily grown with the plant on which he had been subsisting. As they pa.s.sed this ground, each of the girls, Naida leading, made a strange little bowing, gliding genuflection, and Kirby wondered.

Now, however, new sights distracted him as they crossed a port drawbridge above a deep moat which was a fairyland of aquatic plants.

Although not a sound had come from the castle, the great entrance doors were swinging back.

"Be ready," Naida whispered, "for almost anything. The doors are being opened by some of the palace guard. I have little doubt that word was long ago rushed to the caciques that we are come to them with an upper-world man!"

Kirby answered with a nod. Then they pa.s.sed the outer doors, pa.s.sed inside, and Kirby blinked at what he saw.

In a long hall decorated bewilderingly with a carven frieze in which appeared all of the symbols common to early Mexican religions, and many new ones, stood a row of bright suits of armor of the Sixteenth Century.

From each suit peered the gla.s.sy face and shovel beard of a dead Conquistadore.

So this was what happened to intruders from the upper world! The Conquistadore who kept his long watch beside the geyser was not the only one! Kirby felt an involuntary chill p.r.i.c.kle up his back. But he was not given long to think before Naida, ignoring the gruesome array, clasped his arm.

"Look! Behold!"

And Kirby saw that with almost magical silence the whole wall at the end of the corridor was sliding back to reveal an enormous amphitheatre in the center of which stood a vast circular table. Ranged in a semicircle about that table, stood fifteen incredibly ancient men clad in long, glistening grey robes. Blanched beards trailed down the front of the garments until they all but touched the floor.

The caciques!

Kirby, on the threshold of the amphitheatre, squared his shoulders and held his head high. Then with Naida on his right, his own eyes boring unyieldingly into the smouldering, narrowed eyes which stared at him, he advanced.

But in front of him the priests moved suddenly. From Naida burst a shriek. In the radiant glare of the council room flashed the long, thin, cruel blade of a sacrificial knife.

The cacique who had whipped it from his robe flew at Kirby with a condor swoop, talon-hands outstretched, his wrinkled, bearded face contorted with fury.

CHAPTER V

Before Kirby was more than half set to fight, the priest was clawing at his throat, and a gnarled old fist was poised to drive the knife in a death stroke.

Kirby did the only thing he could do quickly--sprang to one side. The move saved him. The knife whipped past his shoulder, and the cacique nearly fell. But it had been a close enough squeak for all that.

Nor was it over. After Kirby the priest sprang with unexpected agility, and before Kirby could s.n.a.t.c.h at his pistol the talon-hands were lunging at his throat once more.

With the gasps of the girls ringing in his ears, Kirby bunched himself for another side leap only to find the cacique all over him like an octopus. Momentarily the knife hung above his chest, and Kirby, dismayed at the powers of his opponent, almost felt that the thing must plunge before he could break the octopus hold.

But he had no intention of being defeated, and now he was getting used to the fight. The priest's left arm swiftly clenched about his neck and shoulders, and the right arm, with the knife, attempted a drive through to the heart. Suddenly, however, Kirby lurched sideways and backward, and as the octopus grip slackened for a flash, he himself got a wrestler's grip that left him ready to do business. As the priest broke free, he slid around in an attempt to fasten himself on Kirby's back.

Quickly, tensely Kirby doubled, and knew that he had done enough. The cacique shot over his shoulders, described a somersault in midair, and landed with a sharp crack of head and shoulders against unyielding stone.

From the semicircle of other priests went up a gasp. From Naida came a strangled cry of joy. Kirby made one leap for the knife which had fallen from the cacique's hand as he slumped into unconsciousness, and then he straightened up with the weapon safe in his possession.

"There, you old billygoat," he croaked in English, "maybe you won't try any more fast ones for awhile."

A second later he stepped over the sprawled body to stand beside Naida.

Upon the wrinkled countenances of the remaining caciques was stamped a look of dismay and hatred which boded no good. It was plain to Kirby that in battering up the man detailed to kill him, he had committed a desecration of first order.

"Is there anyone else who cares to fight?" he flung at them in Spanish, showing a contempt as great as their rage.

The response he got was instant. From one old gullet, then from others, came choking, snarling sounds which presently became words. By those words Kirby heard himself cursed with a vituperation which made him, even in his temporary triumph, feel grave.

But he did not let that soberness trouble him long. For the main point now was that no one made a move to fight further, which was what he had expected. He had flung them the challenge, knowing that he was possessed of their knife, and suspecting that it was their only weapon. The belief that no one would care to try a barehanded conflict, no matter what insult was waiting to be avenged, seemed justified as none of the caciques advanced, and as even the cursing presently ceased.

"No?" Kirby asked. "There is to be no more fighting?"

One of the caciques now came forward a few steps.

"No," he answered with a lameness which was not to be denied. "But you, a criminal interloper in our realm, have been marked as a victim for sacrifice, and from this there is no power in the universe which can save you."

Kirby, after a rea.s.suring glance at Naida, looked at the floored priest who was sitting up now, looking stupidly about, and feeling himself all over, and Kirby suppressed a grin.

"Ah, I am to be sacrificed, eh? But what happens until that time comes?

Listen my Wise Ones--"

He stabbed a finger at them, and his eyes flashed.

"Listen! What you mean to say is that I have defeated you, and you must lay off me until you can launch another attack. But I have a few things to say to that. One is that I am not going to permit myself to _be_ sacrificed. Another is that I demand, right here and now, that you begin to discuss with me certain agreements which are going to regulate the future conduct of affairs in this world to which I have come."

A low exclamation answered that, but it came from no priest. They remained sullen and staggered. It was Naida who murmured, and there was excitement and pleasure in her voice. Suddenly she placed her lips against Kirby's ear.