He followed a crooked lane, reconnoitered previously. It was too narrow for cars and it soon became a mere path. At the path’s forking he ensconced himself in the shadow of a broad, mistletoe-blotted oak. The path was used by certain late pedestrians who lived even farther out from town. One of them might come along at any moment.

Whimpering a little, with the hunger of a starved hound, he waited. He was a monster that nature had made, ready to obey nature’s first commandment: Thou shalt kill and eat. He was a thing of terror… a fable whispered around prehistoric cavern-fires… a miscegenation allied by later myth to the powers of hell and sorcery. But in no sense was he akin to those monsters beyond nature, the spawn of a new and blacker magic, who killed without hunger and without malevolence.

He had only minutes to wait, before his tensing ears caught the far-off vibration of footsteps. The steps came rapidly nearer, seeming to tell him much as they came. They were firm and resilient, tireless and rhythmic, telling of youth or of full maturity untouched by age. They told, surely, of a worthwhile prey; of prime lean meat and vital, abundant blood.

There was a slight froth on the lips of the one who waited. He had ceased to whimper. From pads to jaws, from hackles to tail, he grew taut for the anticipated leap.

The path ahead was heavily shadowed. Dimly, moving fast, the walker appeared in the shadows. He seemed to be all that the watcher had surmised from the sound of his footsteps. He was tall and well-shouldered, swinging with a lithe sureness, a precision of powerful tendon and muscle. His head was a faceless blur in the gloom. He was hatless, clad in dark coat and trousers such as anyone might wear. His steps rang with the assurance of one who has nothing to fear, and has never dreamt of the crouching creatures of darkness.

Now he was almost abreast of the watcher’s covert. The watcher could wait no longer but sprang from his ambush of shadow, towering high upon the stranger as his hind-paws left the ground. His rush was irresistible, as always. The stranger toppled backward, sprawling and helpless, as others had done, and the assailant bent to the bare throat that gleamed more enticingly than that of a siren.

It was a strategy that had never failed… until now….

The shock, the consternation, had hurled him away from that prostrate figure and had forced him back upon teetering haunches. It was the shock, perhaps, that had caused him to change again, swiftly, resuming human shape before his hour. As the change began, he spat out several broken lupine fangs; and then he was spitting human teeth.

The stranger rose to his feet, seemingly unshaken and undismayed. He came forward in a rift of revealing moonlight, stooping to a half-crouch, and flexing his beryllium-steel fingers enameled with flesh-pink.

“Who—what—are you?” quavered the werewolf.

The stranger did not bother to answer as he advanced, every synapse of the computing brain transmitting the conditioned message, translated into simplest binary terms, “Dangerous. Not human. Kill!”

PHOENIX

Rodis and Hilar had climbed from their natal caverns to the top chamber of the high observatory tower. Pressed close together, for warmth as well as love, they stood at an eastern window looking forth on hills and valleys dim with perennial starlight. They had come up to watch the rising of the sun: that sun which they had never seen except as an orb of blackness, occluding the zodiacal stars in its course from horizon to horizon.

Thus their ancestors had seen it for millenniums. By some freak of cosmic law, unforeseen, and inexplicable to astronomers and physicists, the sun’s cooling had been comparatively sudden, and the earth had not suffered the long-drawn complete desiccation of such planets as Mercury and Mars. Rivers, lakes, seas, had frozen solid; and the air itself had congealed, all in a term of years historic rather than geologic. Millions of the earth’s inhabitants had perished, trapped by the glacial ice, the centigrade cold. The rest, armed with all the resources of science, had found time to entrench themselves against the cosmic night in a world of ramified caverns, dug by atomic excavators far below the surface.

Here, by the light of artificial orbs, and the heat drawn from the planet’s still-molten depths, life went on much as it had done in the outer world. Trees, fruits, grasses, grains, vegetables, were grown in isotope-stimulated soil or hydroponic gardens, affording food, renewing a breathable atmosphere. Domestic animals were kept; and birds flew; and insects crawled or fluttered. The rays considered necessary for life and health were afforded by the sunbright lamps that shone eternally in all the caverns.

Little of the old science was lost; but, on the other hand, there was now little advance. Existence had become the conserving of a fire menaced by inexorable night. Generation by generation a mysterious sterility had lessened the numbers of the race from millions to a few thousands. As time went on, a similar sterility began to affect animals; and even plants no longer flourished with their first abundance. No biologist could determine the cause with certainty.

Perhaps man, as well as other terrestrial life-forms, was past his prime, and had begun to undergo collectively the inevitable senility that comes to the individual. Or perhaps, having been a surface-dweller throughout most of his evolution, he was inadaptable to the cribbed and prisoned life, the caverned light and air; and was dying slowly from the deprivation of things he had almost forgotten.

Indeed, the world that had once flourished beneath a living sun was little more than a legend now, a tradition preserved by art and literature and history. Its beetling Babelian cities, its fecund hills and plains, were swathed impenetrably in snow and ice and solidified air. No living man had gazed upon it, except from the night-bound towers maintained as observatories.

Still, however, the dreams of men were often lit by primordial memories, in which the sun shone on rippling waters and waving trees and grass. And their waking hours were sometimes touched by an undying nostalgia for the lost earth … .

Alarmed by the prospect of racial extinction, the most able and brilliant savants had conceived a project that was seemingly no less desperate than fantastic. The plan, if executed, might lead to failure or even to the planet’s destruction. But all the necessary steps had now been taken toward its launching.

It was of this plan that Rodis and Hilar spoke, standing clasped in each other’s arms, as they waited for the rising of the dead sun.

“And you must go?” said Rodis, with averted eyes and voice that quavered a little.

“Of course. It is a duty and an honor. I am regarded as the foremost of the younger atomicists. The actual placing and timing of the bombs will devolve largely upon me.”

“But—are you sure of success? There are so many risks, Hilar.” The girl shuddered, clasping her lover with convulsive tightness.

“We are not sure of anything,” Hilar admitted. “But, granting that our calculations are correct, the multiple charges of fissionable materials, including more than half the solar elements, should start chain-reactions that will restore the sun to its former incandescence. Of course, the explosion may be too sudden and too violent, involving the nearer planets in the formation of a nova. But we do not believe that this will happen—since an explosion of such magnitude would require instant disruption of all the sun’s elements. Such disruption should not occur without a starter for each separate atomic structure. Science has never been able to break down all the known elements. If it had been, the earth itself would undoubtedly have suffered destruction in the old atomic wars.”