In less than an hour there were nearly five thousand cruisers in air-level six, patroling its entire depth from thirty-five thousand to one hundred thousand feet alt.i.tude.

We resumed work in the hangar, but the news service was kept in operation as far as the amplifiers were concerned, though the television screen was switched off on account of the likelihood of its distracting the workers.

Again came the report of a major disaster, this time over b.u.t.te in Montana. Four American vessels and one British were the victims in level six. And the city of b.u.t.te was in flames; blue, horrible flames that literally melted the city into the ground. Again there was no trace of the invaders.

How puny were the efforts of the five thousand air cruisers! Marvels of engineering and mechanical skill, these vessels were. Deadly as were the weapons they carried--weapons so terrible that war on earth was considered impossible since their development--they were helpless against an enemy who could not be located. Though our vessels were capable of boring high into the stratosphere, the enemy worked from still higher.

"Holy smoke!" gasped Hart Jones, who had stopped at my side. "What a contract I have on my hands!"

He looked in the direction of the partly dismantled _Pioneer_, and I could see by the fixedness of his stare that he was thinking of her insignificant size in comparison with the job she was to undertake.

Above the din of the machines in the hangar rang the startled voice of a news announcer. Panic-stricken he seemed, and we stopped to listen.

Another blow of the terror of the skies--and now close by! Over Westchester County in New York State there was a repet.i.tion of the previous attacks. Only two of the cruisers had vanished this time; but several towns, including Larchmont and Scarsdale, were pools of molten fire!

Sick at heart, I thought of my little home in Rutherford and of the dear ones it contained. I thought of telephoning, but, what was the use?

There was no warding off of this terrible thing that had so suddenly come to our portion of the world. It was the blowing of the last trumpet, the way things looked.

The announcer had calmed himself. His voice droned tonelessly now, as was the custom. Another raid, on the Mexican Border now. We were stupefied by the rapidity of the enemy's attacks; then electrified once more by the most astounding news of all. Alexandria, in Egypt, was the base of a pillar of fire! Fully half of the city was wiped out, and the remainder in a mortal funk, terrorized and riotous. The United States was not alone in the war!

The foreign fleets which reinforced our own were ordered home immediately. But to what avail? The world was doomed!

In the morning, after nine fearful attacks during the night, there came another message from the enemy and this was repeated in five languages and addressed to the entire world:

"People of Earth," it read, "this is our final warning. One chance has been given and you have proved stubborn. Consider well that your civilization be not entirely destroyed, and answer as the expiration of forty-eight hours, using our transmitting frequency. Our hand is to be withheld for that period only, when, unless our demands are met, all of your large cities and towns will be destroyed. Our terms for peace are that we be permitted to land without resistance on your part; that you surrender farm and forest lands, cities and towns, able-bodied men of twenty to forty, selected women of seventeen to thirty, and tribute in the form of such supplies and precious metals as we may specify, all to the extent of forty per cent of your resources. No compromise will be accepted."

That was all. It was during a rest period at the Jones hangar and I had brought Hart and George to my home for breakfast. We sat at the table when the news instrument brought the message. Marie was pouring the coffee, and my two small boys, Jim and Jack, had gone to the playroom, from whence their joyous voices could be heard. We four were struck dumb at the announcement, and Marie looked at me with so awful an expression of dread that my coffee turned bitter in my mouth. Marie was just twenty-eight!

"What beasts!" cried Hart. "Allow them to land without resistance? I should say not! Rather we should fight them off until all of us perish."

He had risen from his chair in his anger. Now he sat down suddenly and shook a forefinger in my face.

"Say!" he exploded. "You can't tell me that some master mind of our own world is not back of this!"

"I'm not telling you," I replied, startled at the fierce fire that flashed from his eyes.

"I know. I'm just trying to think aloud and I'm liable to say anything.

But this sort of business is the work of humans as sure as you're born.

Still I believe that what Simler says is true. I can't believe that any country on earth is back of the thing. It must be an attack from beings of another planet, but I think they have as a leader a man who is of our own earth."

Marie's eyes opened wide at this. "But how could that be?" she asked.

"Surely no one from our earth has made the trip to one of the other planets?"

"It may be that someone has," replied Hart. "Do you remember Professor Oradel? Remember, about ten years ago, I think it was, when he and a half dozen or more of extremely radical scientists built a rocket they claimed would reach the moon? They were ridiculed and hissed and relegated to the position of half-baked, crazy inventors. But Oradel had a large private fortune, and he and his crowd built themselves a workshop and laboratory in a secluded region in the Ozarks. Here they labored and experimented and eventually the rocket ship was constructed.

No person was in their confidence, but when the machine was completed they issued a statement to the press to the effect that they were ready for the voyage to the moon, and that, when they returned, a reckoning with the world was to be made for its disbelief and total lack of sympathy. Again the press subjected Oradel to a series of scathing denunciations, and the scientific publications refused to take cognizance of his claims in any way, shape or form."

"Then, one night, a great rocket roared into the heavens, leaving a terror-stricken countryside in the wake of its brilliantly visible tail.

Several observatories whose telescopes picked up and followed the trail of the contraption reported that it described a huge parabola, mounting high into the stratosphere and falling back to earth, where it was lost in the depths of the Pacific Ocean. There the thing ended and it was soon forgotten. But I believe that this rocket ship of Oradel's reached Mars or Venus and that the peoples of whichever planet they reached have been prevailed upon and prepared to war upon the world."

"That would explain their knowledge of our languages and codes." I ventured, "and would likewise account for the fact that the first of our ships to be attacked were those carrying large shipments of currency.

Though if these were destroyed by the fire columns, I can not see what good the money would do them."

"Don't believe the first three were destroyed," grunted Hart. "You'll remember that in these cases the pillars of fire, or whatever you want to call them, were of a cold light, whereas now they are viciously hot and leave behind them the terrible destructive fires that spread and spread and seemingly never are extinguished. No, I think that the force used is something of the nature of an atom-disrupting triad of beams and that these set up the column as a veritable tornado, a whirling column of roaring wind rushing skyward with tremendous velocity. The first ships, I believe, were carried into the stratosphere and captured intact by the enemy.

"Since the declaration of war the nature of the column has altered. The three beams, instead of meeting at or near the surface of the earth, now join high in the heavens and the column strikes downward instead of expending its force upward. An added energy is used which produces the terribly destructive force below. And now we are able to locate fragments of the ships destroyed above, whereas previously there were no traces."

"Sounds reasonable," commented George. "But why have they not landed and waged their war right here without warning, if that is what they now intend to do?"

"A natural question, George. But I have a hunch that the s.p.a.ce flier or fliers of the enemy are conserving fuel by remaining beyond gravity. You know, in s.p.a.ce flying, the greatest expenditures of energy are in leaving or landing on a body and, once landed, they might not have sufficient fuel for a getaway. They know we are not exactly helpless, once they are in our midst, and are taking this means of reducing us to the point of complete subjection before risking their precious selves among us."

The telephone startled us by its insistent ring. It was a call from the hangar for Hart. The news broadcast announcer was in the midst of a long dissertation regarding the discovery only this morning that there were certain apparent discrepancies in the movements of the tides and unwonted perturbations of the moon's...o...b..t. There flashed on the screen a view of the great observatory at Mount Wilson, and Professor Laughlin of that inst.i.tution stepped into the foreground of the scene to take up the discussion so mechanically repeated by the announcer.

"Must leave for the hangar at once," declared Hart, returning from the telephone. "Simler and his staff are there and we are wanted immediately."

"Oh, Jack!" Marie begged with her eyes.

"Got to be done, Honey," I responded, "and, believe me, I am going to do what little I can to help. Suppose we surrendered!"

I shuddered anew at the very thought and took hurried leave of my family, Hart and George awaiting me in the hall. Had I known what was to transpire before the end of the war, I am certain I would have been in much less of a hurry.

We rushed to the hangar, where Secretary Simler and his party awaited us in the office. Rather, I should say, they waited for Hart Jones.

"Mr. Jones," said the Secretary of War, when the introductions were over, "it is up to you to get the _Pioneer_ in shape to go out after these terrible creatures before the forty-eight hours have expired. We have replied to their ultimatum and have told them we will have our answer ready within the appointed time, but it is already agreed between the nations of the World Alliance that our reply is to be negative.

Better far that we submit to the utter destruction of our civilization than agree to their terms."

"I believe I can do it, Mr. Secretary," was Hart Jones' simple comment.

"At least I will try. But you must let me have an experienced astronomer at once with whom to consult."

"Astronomer?"

"Yes--immediately. I have a theory, but am not enough of a student of astronomy myself to work it out."

"You shall have the best man in the Air Naval Observatory at once."

Secretary Simler chewed his cigar savagely. "And anything else you might need," he concluded.