"I have been wondering about that," said Sarka softly, "for it is my belief that nothing not conducive to his own selfish interests would have forced Dalis to leave this place and take command of his Gens, as I had first ordered, unless he had schemes planned of which father and I could know nothing. Now that I think of it, Jaska, how did Dalis know our secret code of fingers?"

Jaska started, and turned a blanched face to Sarka.

"_Did_ he know?" she cried. "Did he? If he did that proves a suspicion that I have entertained since the first moment when Dalis swept into the fight, and I sensed that alien signals were being flashed back and forth!"

"Flashed back and forth!" e.j.a.c.u.l.a.t.ed Sarka. "How do you mean? That Dalis was somehow able to communicate with the Moon-men in their own language, or through their own signals?"

"Why not? He knew our secret code, did he not? I never gave it to him, and I know that you did not. No, Dalis has some means, never discovered or suspected by you Sarkas, whereby he is able to understand alien tongues and alien sign manuals!"

"That means," said Sarka the Elder in a dead voice, "that by forcing Dalis to go out at the head of his Gens...."

"We have," interrupted Sarka the Younger, "placed a new weapon of treason in his hands! Dalis, at the very moment of contact with the aircars, loaded with Moon-men, broke in on their signals--they must have had some means of signalling one another--and communicated with them in their own way! Do you think it possible that, with all his Gens, he may go over to the Moon-men, form an alliance with them?"

For many moments no one dared to answer the question; yet, from what the Sarkas knew of him, it was not impossible at all. For Dalis was the master egotist always, and never overlooked opportunity to gain something for himself.

It was Jaska who broke the silence.

"Did you note carefully," she said, "those aircars which were partially destroyed by our ray directors and atom-disintegrators?"

The Sarkas nodded.

"Did you note that no men, formed like our own, no creatures of any sort whatever, fell from the cars?"

Again the awesome silence, and the keen brains of the Sarkas wrestled with this vague hint of the uncanny.

"You mean, Jaska ... you mean...."

"That the occupants of aircars are part of the cars, but--Beings of the Moon! That they are either metal monsters endowed with brains or tiny creatures irrevocably attached to the cars themselves!"

"But how," said Sarka at last, "are we to be sure? I can understand what Dalis might do if the Moon-men granted his wish for an alliance with them. It is easy to understand why his Gens would follow his lead, for with the Moon forced outward from the Earth faster than his Gens could retreat, there is but one direction for his Gens to go--toward the Moon! They would go to the Moon as captives and trust the keen brain of Dalis to gain the mastery, sooner or later, over the Moon-men. And then...."

"And then--?" repeated Sarka the Elder.

"Then, Dalis has already been inspired by the speed with which those aircars travel! You will remember that he did not take kindly to leaving the Earth and making his abode on some other planet! But why could he not do so, combine forces and knowledge with the people of that planet--and then return to Earth in alliance with them?--after we have depleted our forces by placing a large portion of our people on Mars and Venus and Saturn?"

"Sarka, my son," said Sarka's father, "before we continue with our flight to Mars, we must know the truth! We must somehow learn exactly what is going on on the Moon! If you could reach the Moon, alone, undetected, and bring back a report...."

For a moment he left it there, and the faces of all three were gray with worry and abysmal fear.

"I can't go bodily, father," said Sarka at last, "but you remember my secret exit dome, to the right of the observatory, from which I have never yet dared exit from this place for fear that it might cost me my life?"

Sarka the Elder nodded, while Jaska looked puzzled. Another evidence of the fact that Sarka had not always trusted her, for she knew nothing of a secret exit dome. Sarka's eyes, as he looked at Jaska, mutely asked her forgiveness, which she gave him with her smile.

"I remember, son, and now?..."

"Surely it is worth risking one's life to know what new menace looms over the children of men!"

"What is the use of this secret dome?" asked Jaska softly.

"It is merely an elaboration of the regular exit dome, combined with certain phases of our atom-distintegrators, and the principle involved in the anti-gravitational ovoids. I step into the secret exit dome, garbed for flight Outside, and will myself to appear bodily in a certain place. It is instantaneous. I step into the dome, for example, and will myself to appear whole upon the Moon, and there I will appear!"

"You mean that during the period of transposition you are invisible?"

"Yes, invisible because non-existent, except for the essential elements of me, broken down by the secret exit dome, rea.s.sembled at the place willed in their entirety! I can't fly there, for a million eyes would see me approach! I must go in secret, as a spy, and wearing the clothing and insignia of a member of the Gens of Dalis!"

Silence in the observatory for a brief breathing s.p.a.ce, and then Jaska spoke that speech out of the books of antiquity, which remains the cla.s.sic expression of loyalty.

"Whithersoever thou goest, there will I go also!"

From the laboratory came a sudden burst of laughter, the laughter which all three recognized as the laughter of Dalis; but when they entered the place of the Revolving Beryl, there was no one there--and a feeling of dread, all encompa.s.sing, held them thralled for the s.p.a.ce of several heart-beats. Dalis, they knew, was thousands of miles away, upon the Moon; yet here in the place of the Master Beryl they all three had just heard his sardonic laughter!

CHAPTER XII

_Ashes of the Moon_

Through the micro-telescopes it was possible to see what had happened after Dalis had a.s.sumed command of the Gens of Dalis. For even though the Moon, in spite of the speed of the Beryls, was being forced further and further from the Earth, the eyes of the micro-telescopes picked out and enlarged details to such an extent that the battle seemed to be transpiring under the eyes of the beholders.

A terrific jumble, in which Earthlings and aircars were all tumbled together in mad chaos, a great ma.s.s of writhing, green-garbed figures.

Infinite in number--in the midst of which were the gigantic aircars, like monster beetles being beset by armies upon armies of ants.

Then, by the time Jaska had seated herself in the observatory atop the Himalayas, to watch what developed, the battle seemed to be over, and the Moon-men had won. For the huge cars swung around between the myriads of the Gens of Dalis, and seemed to be herding them toward the Moon, as though they were prisoners.

Telepathically, Sarka and his father had been able to catch some hint of the thoughts of the Earthlings in the battle, and these thoughts had been tinged with doubt, fear and horror, so that even thus to receive them, by mental telepathy, was to feel the searing heat of their fear.

Now, in the instant when the battle in s.p.a.ce seemed to be over and the Gens of Dalis were prisoners, the thought waves were no more, and a brooding silence took their place. Dalis, the Sarkas knew, possessed the power to mask his thoughts, for it was a power possessed in common by all the scientists of Earth. But the common people of his Gens did not posses that power. However, for the moment Sarka had forgotten an all important something: that, when people were outside the roof of the world, they were subservient to the will of a common commander to whom they had sworn allegiance.

If, therefore, Dalis could mask his own thoughts from the brains of men, he could also mask the thoughts of the people of his Gens, merely by willing it! So Sarka and his father and Jaska could not know whether the Gens of Dalis had gone over in a body with him, in a truce with the people of the Moon, or whether they were dual prisoners--of Dalis and of the Moon-men!

More than ever was it necessary for someone to somehow reach the Moon and make a thorough investigation, discover just what Dalis was doing, what mischief he was hatching.

The secret exit dome seemed to be the answer.

"You can manage without me, father?" asked Sarka.

The elder Sarka nodded.

"Of the other Spokesmen of Earth," went on Sarka, "I trust Gerd the most. Might I suggest that you bring him here, trust him in all details, and let him take my place wherever possible? Or, better still, keep Jaska here with you! I ... I may not be able to return!