"I'm all right," she said breathlessly. "I was worried about you."

The roaring of motors outside the hospital interrupted them. More and more vehicles arrived, until a deep purring filled the air. A Greek doctor with a worried expression hurried somewhere. Soldiers appeared, hard-bitten, tough, professional Greek soldiers. Hallen came out of a hospital room. The Greek general appeared with one of the two colonels who'd been at the airport. The general nodded, and his eyes seemed cordial. He waved them ahead of him into a waiting elevator. The elevator descended. They went out of the hospital and there was an armored car waiting. An impressive escort of motorcycle troops waited with it.

The Greek general saw Coburn's cynical expression at sight of the guards. He explained blandly that since oxygen brought sleeping Bulgarians out of their slumber--and had been used on them--oxygen was handy for use by anybody who experienced a bright flash of light in his mind. The Bulgarian soldiers, incidentally, said that outside the village of Ardea they'd felt as if the sunlight had brightened amazingly, but they felt no effects for two hours afterward, when they fell asleep at Naousa. So, said the general almost unintelligibly, if anything untoward happened on the way to the airport, everybody would start breathing oxygen. A sensation of bright light would be untoward.

The armored car started off, with motorcyclists crowded about it with weapons ready. But the ride to the airport was uneventful. To others than Janice and Coburn it may even have been tedious. But when she understood the general's explanation, she shivered a little. She leaned insensibly closer to Coburn. He took her hand protectively in his.

They reached the airport. They roared through the gateway and directly out upon the darkened field. Something bellowed and raced down a runway and took to the air. Other things followed it. They gained alt.i.tude and circled back overhead. Tiny bluish flickerings moved across the overcast sky. Exhaust flames.

Coburn realized that it was a fighter plane escort.

The huge transport plane that waited for them was dark. They climbed into it and found their seats. When it roared down the unlighted field and took to the air, everything possible had been done to keep anybody from bringing any weapon to bear upon it.

"All safe now!" said the voice of the American colonel in the darkness of the unlit plane, as the plane gained height. "Incidentally, Coburn, why did you want to look at Pangalos' palm? What did you expect to find there?"

"When I started for the airport," Coburn explained, "I bent a pin around the band of a ring I wear. I could let it lie flat when I shook hands.

Or I could make it stand out like a spur. I set it with my thumb. I saw Pangalos' eyes, so I had it stand out, and I made a tear in his plastic skin when I shook hands with him. He didn't feel it, of course." He paused. "Did anybody go to the address I gave Hallen?"

Hallen said, in the darkness: "Major Pangalos got there first."

The blackness outside the plane seemed to grow deeper. There was literally nothing to be seen but the instrument dials up at the pilots'

end of the ship.

The Greek general asked a question in his difficult English.

"Where'd they come from?" repeated Coburn. "I've no idea. Off Earth, yes. A heavy planet, yes. I doubt they come from our solar system, though. Somewhere among the stars."

The Greek general said something with a sly up-twist of his voice.

Whatever and whoever the Invaders were, he said, they did not like Bulgarians. If they'd knocked out the raiding party simply to test their weapons against human subjects, at least they had chosen suitable and pleasing subjects for the test.

There was light. For an instant Coburn tensed. But the plane climbed and the brightness steadied. It was the top of a cloud bank, brilliantly white in the moonlight. They had flown up through it, and it reached as far ahead as they could see. A stubby fighter plane swam up out of the mist and fell into position alongside. Others appeared. They took formation about the transport and all flew steadily through the moonlight.

"I wish I knew," said the American colonel vexedly, "if those creatures were only testing weapons, or if they were getting set to start bargaining with us!"

"Meaning?" asked Coburn.

"If they're here," said the colonel angrily, "and if they do mean to meddle in our business, they may set up a sort of auction with us bidding against the Iron Curtain gang for their friendship. And _they'd_ make any deal!"

The Greek general agreed drily. He said that free people were not practical people. They were always ready to die rather than cease to be free. Surely the Greeks had proved themselves ready to die. But people like the Bulgarians thought that to continue to live was the most important thing in the world. It was, of course, the practical view-point....

"They can have it!" growled Coburn.

Janice said hesitantly: "But the Invaders haven't killed anybody we know of. They could have killed the Bulgarians. They didn't. The one who called himself Dillon stopped one man from killing them. And they could have killed us, earlier today at the airport. Could they want to be friends?"

"They're starting the wrong way," said Coburn.

The Greek general stirred in his seat, but he was pointedly silent.

The pilot snapped abruptly from up at the bow of the plane: "Colonel!

sir! Two of the fighters are climbing as if they've spotted something.

There go the rest."

Coburn leaned across Janice to stare out the window. When the fighters were below the transport, they could be seen in silhouette against the clouds. Above, their exhaust flames pin-pointed them. Small blue flames climbed steeply.

The big ship went on. The roar of its motors was steady and unvarying.

From a pa.s.senger seat it was not possible to look overhead. But suddenly there were streaking sparks against the stars. Tracer bullets. Fighters swerved and plunged to intercept something....

And a Thing came down out of the sky with a terrific velocity. Tracer bullets sprayed all around it. Some could be seen to ricochet off its sides. Flashings came from the alien craft. They were not explosions from guns. They were lurid, actinic, smokeless blasts of pure light. The Thing seemed to be made of polished metal. It dodged, trying to approach the transport. The fighters lunged to prevent it. The ghastly game of interception seemed to rush here and there all over the sky.

The strange object was not possibly of human design or manufacture. It had no wings. It left no trail of jet fumes or rocket smoke. It was glittering and mirror-like, and it was shaped almost exactly like two turtle-sh.e.l.ls base to base. It was flat and oval. It had no visible external features.

It flung itself about with incredible darts and jerkings. It could stop stock still as no plane could possibly stop, and accelerate at a rate no human body could endure. It tried savagely to get through the swarming fighters to the transport. Its light weapon flashed--but the pilots would be wearing oxygen masks and there were no casualties among the human planes. Once a fighter did fall off in a steep dive, and fluttered almost down to the cloud bank before it recovered and came back with its guns spitting.

That one appeared to end the fight. It came straight up, pumping tracers at the steel flier from below. And the glittering Thing seemed to stop dead in the air. Then it shuddered. It was bathed in the flaring sparks of tracers. Then--

It dropped like a stone, tumbling aimlessly over and over as it dropped.

It plummeted into the cloud bank.

Suddenly the clouds were lighted from within. Something inside flared with a momentary, terrifying radiance. No lightning bolt ever flashed more luridly.

The transport plane and its escort flew on and on over the moonlit bank of clouds.

Presently orders came by radio. On the report of this attack, the flight plan would be changed, for safety. If the air convoy had been attacked once, it might be attacked again. So it would be wisest to get it immediately to where there would be plenty of protection. Therefore, the transport plane would head for Naples.

Nearly the whole of the United States Mediterranean fleet was in the Bay of Naples just then. It had been there nearly a week, and by day its liberty parties swarmed ash.o.r.e. The merchants and the souvenir salesmen were entranced. American sailors had money and they spent it. The fleet's officers were social a.s.sets, its messes bought satisfyingly of local viands, and everybody was happy.

All but one small group. The newspapers of one of the Italian political parties howled infuriatedly. They had orders to howl, from behind the Iron Curtain. The American fleet, that one party's newspapers bellowed, was imperialistic, capitalistic, and decadent. In short, there was virulent propaganda against the American fleet in Naples. But most people were glad it was there anyway. Certainly n.o.body stayed awake worrying about it.

People were staying awake worrying about the transport plane carrying Coburn and Janice, however. On the plane, Janice was fearful and pressed close to Coburn, and he found it an absorbing experience and was moved to talk in a low tone about other matters than extra-terrestrial Invaders and foam suits and interstellar travel. Janice found those other subjects surprisingly fitted to make her forget about being afraid.

Elsewhere, the people who stayed awake did talk about just the subjects Coburn was avoiding. The convoy carrying Coburn to tell what he knew had been attacked. By a plane which was definitely not made or manned by human beings. The news flashed through the air across continents. It went under the ocean over sea beds. It traveled in the tightest and most closely-guarded of diplomatic codes. The Greek government gave the other NATO nations a confidential account of the Bulgarian raid and what had happened to it. These details were past question. The facts brought out by Coburn were true, too.

So secret instructions followed the news. At first they went only to highly-trusted individuals. In thirty nations, top-ranking officials and military officers blindfolded each other in turn and gravely stuck pins in each other. The blindfolded person was expected to name the place where he had been stuck. This had an historical precedent. In olden days, pins were stuck in suspected witches. They had patches of skin in which there was no sensation, and discovery of such areas condemned them to death. Psychologists in later centuries found that patches of anaesthetic skin were typical of certain forms of hysteria, and therefore did not execute their patients. But the Invaders, by the fact that their seemingly human bodies were not flesh at all, could not pa.s.s such tests.

There were consequences. A Minister of Defense of a European nation amusedly watched the tests on his subordinates, blandly excused himself for a moment before his own turn came, and did not come back. A general of division vanished into thin air. Diplomatic code clerks painstakingly decoded the instructions for such tests, and were nowhere about when they themselves were to be tested. An eminent Hollywood director and an Olympic champion ceased to be.

In the free world nearly a hundred prominent individuals simply disappeared. Few were in position to influence high-level decisions.

Many were in line to know rather significant details of world affairs.

There was alarm.

It was plain, too, that not all disguised Invaders would have had to vanish. Many would not even be called on for test. They would stay where they were. And there were private persons....