he room was smelly and cheap, with dirty walls and no carpet on the floor, but it was a relief after the hours of tramping and riding about the city. Hawkes sat on the rickety chair, letting the wetness dry out of his clothes. He looked at the bed, trying to convince himself he could strip and warm up there while his clothes dried. But something in his head warned him that he couldn't—he'd have to be ready to run again. The same urge had made him demand a room on the ground floor, where he could escape through the window if they found him. They could never find him here—but they would! Sooner or later, whatever was after him would come!

It had seemed simple enough, before. There had been three friends he could trust. Seven months, he had felt, couldn't have killed their faith in him, no matter what he'd done. And perhaps he'd been right, though there'd been no chance to test it.

He'd almost been caught at the first place. The two men outside had seemed to be no more than a couple of friends awaiting for a bus. Only the approach of another man who resembled Hawkes had tipped him off, by the quick interest they had shown.

The other places had also been posted—and beyond the third, he'd seen the gray sedan with the running boards, parked back in the shadows, waiting.

There had been less than ten dollars in his wallet, and most of that had gone for cab fares. He'd barely had enough left for this dingy room, the later edition of the newspaper, and the coffee and donuts that lay beside him, half-consumed.

He glanced toward the door, listening with quick fear as steps sounded on the stairs. Then he drew his breath in again, and reached for the newspaper. But it told him as little as the first one had.

This one mentioned the two mysterious explosions of "ball lightning" in a feature on the first page, but only as curiosities. They even gave his address and listed the apartment as being in his name, though apparently not currently occupied. But no other reference was made to him, or to the chase.

He shook his head at that. He couldn't see a newspaper-man refusing to make a story of it, if there was any other news about him to which they could tie the burning of his apartment. Apparently it was not the police who were after him, and he hadn't been guilty of anything so ordinary as murder.

---

utside the window, a sudden scream sounded, and he jerked from the chair, reaching the door before he realized it was only a cat on the prowl. He shuddered, his old hatred of cats coming to the surface. For a minute, he thought of shutting the window. But he couldn't cut off his chance to retreat through the garbage-littered back-yard.

He returned to his search, beginning an inventory of the few belongings that had been in his pocket. There was a notebook, and he scanned it rapidly. A few pages were missing, and most were blank. There was only a shopping list. That puzzled him for a minute—he couldn't believe he'd taken to using lipstick as well as cigarettes, though both were listed in his handwriting. The notebook contained nothing else.

He stuffed it back into his pockets, along with his keyring. There were more keys than he'd expected, some of which were strange to him, but none held any mark that would identify them. He put a few pennies into another pocket—his entire wealth, now, in a world where no more money would be available to him. He grimaced, dropping a comb into the same pocket.

Then there was only his wallet left. His identification card was there, unchanged. Behind it, where his wife's picture had always been, there was only a folded clipping. He drew it out, hoping for a clew. It was only an announcement of people killed in an airplane crash—and among those found dead was Mrs. Wilbur Hawkes, of New York. It seemed that Irma had never reached Reno for the divorce.

He tried to feel some sorrow at that, but time must have healed whatever hurt there had been, even though he couldn't remember. She had hated him ever since she'd found that he really wasn't willing to please his father by becoming another of the vice-presidents in the old man's bank, with an unearned but fancy salary. He'd preferred teaching mathematics and dabbling with a bit of research into the probable value of the ESP work being done at Duke University. He'd explained why he hated banking; Irma had made it clear that she really needed the mink coat no assistant professor could afford. It had been stalemate—a bitter, seven-year stalemate, until she finally gave up hope and demanded a divorce.

He threw the clipping away, and pulled out the final bit of paper. It was a rent receipt for a cold-water apartment on the poorer section of West End—from the price of eighteen dollars a month, it had to be a cold-water place. He frowned, considering it. Apartment 12. That might explain why his own apartment had been unused, though it made little sense to him. It would probably be watched by now, anyway.

---

e jerked to his feet at a sound on the window-sill, but it was only a cat, eyeing the unfinished donut. He threw the food out, and the cat dived after it. Hawkes waited for the touch of ice along his backbone to go away. It didn't.

This time, he tried to ignore it. He picked up the paper and began going through it, looking for something that might give him some slight clew. But there was nothing there. Only a heading on an inside page that stirred his curiosity.

He glanced at it, noting that a Professor Meinzer, formerly of City College, had appeared at Bellevue, asking to be put away in a padded cell, preferably with a strait-jacket. The Professor had only explained that he considered himself dangerous to society. No other reason was found. Professor Meinzer had been doing private work, believed to relate to his theory that....

The panic was back, thick in Hawkes' throat. He jerked back against the wall, his heart racing, while he tried to fight it down. There was no sound from the hall or outside. He forced his eyes back to the paper.

And the paper was surrounded by a golden haze. It burst into a momentary flame as the haze flickered out. Hawkes dropped the ashes from his clammy hands. He hadn't been burned!

You can't escape. Run. They'll get you!

He heard the outside door open, as it had opened a hundred times. But now it could only mean that more were coming. He jerked for the open window.

Something came sailing through the air to hit the sill. Hawkes screamed weakly, far down in his throat, before his eyes could register the fact that it was only the cat again.

Then the cat let out a horrible beginning of a sound, and its poor, half-starved body seemed to turn inside out, with a churning motion that Hawkes could barely see. Blood and gore spattered from it, striking his face and clothes.

He froze, unable to move. Either they were outside in the yard, or whatever frightful weapon they used could work through a closed door. He tried to move, first one way, then the other. His feet remained frozen.

Then steps sounded in the hallway, and he waited no longer. His legs came to sudden life, hurling him over the carcass of the cat and outside. He went charging through the refuse, and then leaped and clawed his way over the fence. The alley was deserted, and he shot down it, to swing right, and into another alley.

It wasn't until his muscles began to fail that he could control himself enough to stop and stumble into a darkened spot among the garbage cans, spent and gasping for breath.

---

here was no sign of anyone following. Hawkes had no idea of how they could trace him—but he was beginning to suspect that nothing was impossible, judging by the results of their weapons. For the moment, though, he seemed to have shaken off pursuit. And the physical fatigue had apparently eased some of his terror.

What had shocked him into losing seven months out of his memory, and still could drive him into absolute terror at the first sign of them?

He couldn't go back to the room, and his own apartment was out of the question. The rain had stopped, mercifully, but he couldn't walk the streets indefinitely, dirty and bedraggled as he was. He tried to think of something to do, but all of his schemes took money which he no longer had.

Finally, he arose wearily. Maybe the apartment for which he had the rent receipt was watched—but he'd have to chance it. There was no place else.

He'd been accidentally heading toward it, and he continued now, sticking to the alleys until he reached West End Avenue. He tried to hurry, but the best his tired muscles could do was a slow shuffle.

Light was beginning to show faintly in the sky, but it was still too early for more than a few cars and a chance pedestrian. At this hour, the avenue was used by only a few cruising cabs, heading toward better sections. He shuffled along, trying to look like a man on his way home after too much night out. The cat blood on his clothes bothered him, until he tried weaving a little as he walked, imitating the drunks he had seen often enough.

He passed an all night diner, and fished for his pennies. But there were several men inside. He went on, past Fifty-ninth Street, heading for the apartment, which should be near Sixty-seventh.

He was just reaching the top of the hill near Sixty-fourth when a gray sedan sped along, heading downtown. There were running boards on it, and behind the wheel sat the slim young man who'd given chase to Hawkes before.

Hawkes tried to duck, but the sedan was already braking and swinging back. It was beside him before he could realize more than the old clamor of his brain, telling him to run, that he couldn't escape.

The car matched his speed, and the driver leaned far to the right. "Will Hawkes," the young man called. "How about a lift?"

The smile was pleasant, and the voice was casual, as if they were old friends. There was no gun in the man's hands. It might have been any honest offer of a ride.

Hawkes braced himself, just as a patrol car turned onto the Avenue ahead. He opened his mouth to scream, but his vocal cords were frozen. The young man followed his eyes to the patrol car, and frowned.

Then the gray sedan lifted smoothly upwards to a height of twenty feet, turned sharply in mid-air, lifted again, and seemed to make a smooth landing on top of a huge garage building!

There had been no roar of jets and no evidence of any means of propulsion.

---

he patrol car went on down the Avenue, heading for the diner. The officers inside apparently had missed the whole affair.

Hawkes' cowardly legs suddenly came unfrozen. He was conscious of them churning madly. With an effort, he got partial control of himself, managing to focus on the house numbers.

There were no watchers outside the number he wanted, though they could have been in rooms across the street. He had no choice, now. He leaped up the steps and into the hallway. His eyes darted around, spotting a door that led out to the side, probably into an alley. He drew himself together, hiding behind the stairs.

But there was no further pursuit for the moment. The fear that seemed to come before each attack was missing. Maybe it meant he was safe for the moment—though it hadn't warned him of the car the young man was driving.

Heat rays! Levitation! Hawkes dropped to his knees as fatigue and reaction caught up with him again, but his mind churned over the new evidence. As a mathematician, he was sure such things could not exist. If they did, there would have been extension of math well in advance of the perfection of the machines, and he'd have known of it as speculative theory, at least. Yet, without such evidence, the devices apparently existed.

The police weren't in on it, that much was certain. It was more than a hunt for a criminal. What had been going on during the months he had missed?

His mind shuttled over the spy-thrillers he had seen. If some nation had the secrets, and he had discovered them.... But the heat ray would never have been used openly, then; they wouldn't tip their hand. Anyhow, the cold war was still going on, and that would have been pointless when any nation had such power.

And if the secret belonged to the United States, the young man would never have levitated to avoid police at the greater risk of tipping off anyone who saw that such things could be done.

Nothing made sense—not even the crazy feeling of fear that had warned him on some occasions and failed him this last time. The only explanation that was credible was the totally incredible idea that some life, alien to earth and with strange unearthly powers, was after him—or that he was insane.

He fumbled through a pack of cigarettes until he located the last one, streaked with sweat that was still pouring down from his armpit, and lighted it. It was all answer-less—just as his sudden need for smoking was.