He sat in a small half-darkened booth well over in the corner--the man with the strangely glowing blue-green eyes.

The booth was one of a score that circled the walls of the “Maori Hut,” a popular night club in the San Fernando Valley some five miles over the hills from Hollywood.

It was nearly midnight. Half a dozen couples danced lazily in the central dancing space. Other couples remained tête-à-tête in the secluded booths.

In the entire room only two men were dining alone. One was the slender gray-haired little man with the weirdly glowing eyes. The other was Blair Gordon, a highly successful young attorney of Los Angeles. Both men had the unmistakable air of waiting for someone.

Blair Gordon’s college days were not so far distant that he had yet lost any of the splendid physique that had made him an All-American tackle. In any physical combat with the slight gray-haired stranger, Gordon knew that he should be able to break the other in two with one hand.

Yet, as he studied the stranger from behind the potted palms that screened his own booth. Gordon was amazed to find himself slowly being overcome by an emotion of dread so intense that it verged upon sheer fear. There was something indescribably alien and utterly sinister in that dimly seen figure in the corner booth.

The faint eery light that glowed in the stranger’s deep-set eyes was not the lambent flame seen in the chatoyant orbs of some night-prowling jungle beast. Rather was it the blue-green glow of phosphorescent witch-light that flickers and dances in the night mists above steaming tropical swamps.

The stranger’s face was as classically perfect in its rugged outline as that of a Roman war-god, yet those perfect features seemed utterly lifeless. In the twenty minutes that he had been intently watching the stranger, Gordon would have sworn that the other’s face had not moved by so much as the twitch of an eye-lash.

Then a new couple entered the Maori Hut, and Gordon promptly forgot all thought of the puzzlingly alien figure in the corner. The new arrivals were a vibrantly beautiful blond girl and a plump, sallow-faced man in the early forties. The girl was Leah Keith, Hollywood’s latest screen sensation. The man was Dave Redding, her director.

A waiter seated Leah and her escort in a booth directly across the room from that of Gordon. It was a maneuver for which Gordon had tipped lavishly when he first came to the Hut.

A week ago Leah Keith’s engagement to Blair Gordon had been abruptly ended by a trivial little quarrel that two volatile temperaments had fanned into flames which apparently made reconciliation impossible. A miserably lonely week had finally ended in Gordon’s present trip to the Maori Hut. He knew that Leah often came there, and he had an overwhelming longing to at least see her again, even though his pride forced him to remain unseen.

Now, as he stared glumly at Leah through the palms that effectively screened his own booth, Gordon heartily regretted that he had ever come. The sight of Leah’s clear fresh beauty merely made him realize what a fool he had been to let that ridiculous little quarrel come between them.

Then, with a sudden tingling thrill, Gordon realized that he was not the only one in the room who was interested in Leah and her escort.

Over in the half-darkened corner booth the eery stranger was staring at the girl with an intentness that made his weird eyes glow like miniature pools of shimmering blue-green fire. Again Gordon felt that vague impression of dread, as though he were in the presence of something utterly alien to all human experience.

Gordon turned his gaze back to Leah, then caught his breath sharply in sudden amaze. The necklace about Leah’s throat was beginning to glow with the same uncanny blue-green light that shone in the stranger’s eyes! Faint, yet unmistakable, the shimmering radiance pulsed from the necklace in an aura of nameless evil.

And with the coming of that aura of weird light at her throat, a strange trance was swiftly sweeping over Leah. She sat there now as rigidly motionless as some exquisite statue of ivory and jet.

Gordon stared at her in stark bewilderment. He knew the history of Leah’s necklace. It was merely an oddity, and nothing more--a freak piece of costume jewelry made from fragments of an Arizona meteorite. Leah had worn the necklace a dozen times before, without any trace of the weird phenomena that were now occurring.

Dancers again thronged the floor to the blaring jazz of the negro orchestra while Gordon was still trying to force his whirling brain to a decision. He was certain that Leah was in deadly peril of some kind, yet the nature of that peril was too bizarre for his mind to imagine.

Then the stranger with the glowing eyes took matters into his own hands. He left his booth and began threading his way through the dancers toward Leah. As he watched the progress of that slight gray-haired figure Gordon refused to believe the evidence of his own eyes. The thing was too utterly absurd--yet Gordon was positive that the strong oak floor of the dancing space was visibly swaying and creaking beneath the stranger’s mincing tread!

The stranger paused at Leah’s booth only long enough to utter a brief low-voiced command. Then Leah, still in the grip of that strange trance, rose obediently from her seat to accompany him.

Dave Redding rose angrily to intercept her. The stranger seemed to barely brush the irate director with his finger tips, yet Redding reeled back as though struck by a pile-driver. Leah and the stranger started for the door. Redding scrambled to his feet again and hurried after them.

It was then that Gordon finally shook off the stupor of utter bewilderment that had held him. Springing from his booth, he rushed after the trio.

The dancers in his way delayed Gordon momentarily. Leah and the stranger were already gone when he reached the door. The narrow little entrance hallway to the Hut was deserted save for a figure sprawled there on the floor near the outer door.

It was the body of Dave Redding. Gordon shuddered as he glanced briefly down at the huddled figure. A single mighty blow from some unknown weapon had crumpled the director’s entire face in, like the shattered shell of a broken egg.

Gordon charged on through the outer door just as a heavy sedan came careening out of the parking lot. He had a flashing glimpse of Leah and the stranger in the front seat of the big car.

Gordon raced for his own machine, a powerful low-slung roadster. A single vicious jab at the starting button, and the big motor leaped into roaring life. Gordon shot out from the parking lot onto the main boulevard. A hundred yards away the sedan was fleeing toward Hollywood.

Gordon tramped hard on the accelerator. His engine snarled with the unleashed fury of a hundred horsepower. The gap between the two cars swiftly lessened.

Then the stranger seemed to become aware for the first time that he was being followed. The next second the big sedan accelerated with the hurtling speed of a flying bullet. Gordon sent his own foot nearly to the floor. The roadster jumped to eighty miles an hour, yet the sedan continued to leave it remorselessly behind.

The two cars started up the northern slope of Cahuenga Pass with the sedan nearly two hundred yards ahead, and gaining all the time. Gordon wondered briefly if they were to flash down the other side of the Pass and on into Hollywood at their present mad speed.

Then at the summit of the Pass the sedan swerved abruptly to the right and fled west along the Mulholland Highway. Gordon’s tires screamed as he swerved the roadster in hot pursuit.

The dark winding mountain highway was nearly deserted at that hour of the night. Save for an occasional automobile that swerved frantically to the side of the road to dodge the roaring onslaught of the racing cars, Gordon and the stranger had the road to themselves.

The stranger seemed no longer to be trying to leave his pursuer hopelessly behind. He allowed Gordon to come within a hundred yards of him. But that was as near as Gordon could get, is spite of the roadster’s best efforts.

Half a dozen times Gordon trod savagely upon his accelerator in a desperate attempt to close the gap, but each time the sedan fled with the swift grace of a scudding phantom. Finally Gordon had to content himself with merely keeping his distance behind the glowing red tail-light of the car ahead.

They passed Laurel Canyon, and still the big sedan bored on to the west. Then finally, half a dozen miles beyond Laurel Canyon, the stranger abruptly left the main highway and started up a narrow private road to the crest of one of the lonely hills. Gordon slowly gained in the next two miles. When the road ended in a winding gravelled driveway into the grounds of what was apparently a private estate, the roadster was scarcely a dozen yards behind.

The stranger’s features as he stood there stiffly erect in the vivid glare of the roadster’s headlights were still as devoid of all expression as ever. The only things that really seemed alive in that masque of a face were the two eyes, glowing eery blue-green fire like twin entities of alien evil.

Gordon wasted no time in verbal sparring. He motioned briefly to Leah Keith’s rigid form in the front seat of the sedan.

“Miss Keith is returning to Hollywood with me,” he said curtly. “Will you let her go peaceably, or shall I--?” He left the question unfinished, but its threat was obvious.

“Or shall you do what?” asked the stranger quietly. There was an oddly metallic ring in his low even tones. His words were so precisely clipped that they suggested some origin more mechanical than human.

“Or shall I take Miss Keith with me by force?” Gordon flared angrily.

“You can try to take the lady by force--if you wish.” There was an unmistakable jeering note in the metallic tones.

The taunt was the last thing needed to unleash Gordon’s volatile temper. He stepped forward and swung a hard left hook for that expressionless masque of a face. But the blow never landed. The stranger dodged with uncanny swiftness. His answering gesture seemed merely the gentlest possible push with an outstretched hand, yet Gordon was sent reeling backward a full dozen steps by the terrific force of that apparently gentle blow.

Recovering himself, Gordon grimly returned to the attack. The stranger again flung out one hand in the contemptuous gesture with which one would brush away a troublesome fly, but this time Gordon was more cautious. He neatly dodged the stranger’s blow, then swung a vicious right squarely for his adversary’s unprotected jaw.

The blow smashed solidly home with all of Gordon’s weight behind it. The stranger’s jaw buckled and gave beneath that shattering impact. Then abruptly his entire face crumpled into distorted ruin. Gordon staggered back a step in sheer horror at the gruesome result of his blow.

The stranger flung a hand up to his shattered features. When his hand came away again, his whole face came away with it!

Gordon had one horror-stricken glimpse of a featureless blob of rubbery bluish-gray flesh in which fiendish eyes of blue-green fire blazed in malignant fury.

Then the stranger fumbled at his collar, ripping the linen swiftly away. Something lashed out from beneath his throat--a loathsome snake-like object, slender and forked at the end. For one ghastly moment, as the writhing tentacle swung into line with him, Gordon saw its forked ends glow strange fire--one a vivid blue, the other a sparkling green.

Then the world was abruptly blotted out for Blair Gordon.

Consciousness returned to Gordon as swiftly and painlessly as it had left him. For a moment he blinked stupidly in a dazed effort to comprehend the incredible scene before him.

He was seated in a chair over near the wall of a large room that was flooded with livid red light from a single globe overhead. Beside him sat Leah Keith, also staring with dazed eyes in an effort to comprehend her surroundings. Directly in front of them stood a figure of stark nightmare horror.

The weirdly glowing eyes identified the figure as that of the stranger at the Maori Hut, but there every point of resemblance ceased. Only the cleverest of facial masques and body padding could ever have enabled this monstrosity to pass unnoticed in a world of normal human beings.

Now that his disguise was completely stripped away, his slight frame was revealed as a grotesque parody of that of a human being, with arms and legs like pipe-stems, a bald oval head that merged with neckless rigidity directly into a heavy-shouldered body that tapered into an almost wasp-like slenderness at the waist. He was naked save for a loin cloth of some metallic fabric. His bluish-gray skin had a dull oily sheen strangely suggestive of fine grained flexible metal.

The creature’s face was hideously unlike anything human. Beneath the glowing eyes was a small circular mouth orifice with a cluster of gill-like appendages on either side of it. Patches of lighter-colored skin on either side of the head seemed to serve as ears. From a point just under the head, where the throat of a human being would have been, dangled the foot-and-a-half long tentacle whose forked tip had sent Gordon into oblivion.

Behind the creature Gordon was dimly aware of a maze of complicated and utterly unfamiliar apparatus ranged along the opposite wall, giving the room the appearance of being a laboratory of some kind.

Gordon’s obvious bewilderment seemed to amuse the bluish-gray monstrosity. “May I introduce myself?” he asked with a mocking note in his metallic voice. “I am Arlok of Xoran. I am an explorer of Space, and more particularly an Opener of Gates. My home is upon Xoran, which is one of the eleven major planets that circle about the giant blue-white sun that your astronomers call Rigel. I am here to open the Gate between your world and mine.”

Gordon reached a reassuring hand over to Leah. All memory of their quarrel was obliterated in the face of their present peril. He felt her slender fingers twine firmly with his. The warm contact gave them both new courage.

“We of Xoran need your planet and intend to take possession of it,” Arlok continued, “but the vast distance which separates Rigel from your solar system makes it impracticable to transport any considerable number of our people here in space-cars for, though our space-cars travel with practically the speed of light, it requires over five hundred and forty years for them to cross that great void. So I was sent as a lone pioneer to your Earth to do the work necessary here in order to open the Gate that will enable Xoran to cross the barrier in less than a minute of your time.

“That gate is the one through the fourth dimension, for Xoran and your planet in a four-dimensional universe are almost touching each other in spite of the great distance separating them in a three-dimensional universe. We of Xoran, being three-dimensional creatures like you Earthlings, can not even exist on a four-dimensional plane. But we can, by the use of apparatus to open a Gate, pass through a thin sector of the fourth dimension and emerge in a far distant part of our three-dimensional universe.

“The situation of our two worlds,” Arlok continued, “is somewhat like that of two dots on opposite ends of a long strip of paper that is curved almost into a circle. To two-dimensional beings capable only of realizing and traveling along the two dimensions of the paper itself those dots might be many feet apart, yet in the third dimension straight across free space they might be separated by only the thousandth part of an inch. In order to take that short cut across the third dimension the two-dimensional creatures of the paper would have only to transform a small strip of the intervening space into a two-dimensional surface like their paper.

“They could, do this, of course, by the use of proper vibration-creating machinery, for all things in a material universe are merely a matter of vibration. We of Xoran plan to cross the barrier of the fourth dimension by creating a narrow strip of vibrations powerful enough to exactly match and nullify those of the fourth dimension itself. The result will be that this narrow strip will temporarily become an area of three dimensions only, an area over which we can safely pass from our world to yours.”

Arlok indicated one of the pieces of apparatus along the opposite wall of the room. It was an intricate arrangement of finely wound coils with wires leading to scores of needle-like points which constantly shimmered and crackled with tiny blue-white flames. Thick cables ran to a bank of concave reflectors of some gleaming grayish metal.

“There is the apparatus which will supply the enormous power necessary to nullify the vibrations of the fourth dimensional barrier,” Arlok explained. “It is a condenser and adapter of the cosmic force that you call the Millikan rays. In Xoran a similar apparatus is already set up and finished, but the Gate can only be opened by simultaneous actions from both sides of the barrier. That is why I was sent on my long journey through space to do the necessary work here. I am now nearly finished. A very few hours more will see the final opening of the Gate. Then the fighting hordes of Xoran can sweep through the barrier and overwhelm your planet.

“When the Gate from Xoran to a new planet is first opened,” Arlok continued, “our scientists always like to have at least one pair of specimens of the new world’s inhabitants sent through to them for experimental use. So to-night, while waiting for one of my final castings to cool, I improved the time by making a brief raid upon the place that you call the Maori Hut. The lady here seemed an excellent type of your Earthling women, and the meteoric iron in her necklace made a perfect focus for electric hypnosis. Her escort was too inferior a specimen to be of value to me so I killed him when he attempted to interfere. When you gave chase I lured you on until I could see whether you might be usable. You proved an excellent specimen, so I merely stunned you. Very soon now I shall be ready to send the two of you through the Gate to our scientists in Xoran.”

A cold wave of sheer horror swept over Gordon. It was impossible to doubt the stark and deadly menace promised in the plan of this grim visitor from an alien universe--a menace that loomed not only for Gordon and Leah but for the teeming millions of a doomed and defenseless world.

“Let me show you Xoran,” Arlok offered. “Then you may be better able to understand.” He turned his back carelessly upon his two captives and strode over to the apparatus along the opposite wall.

Gordon longed to hurl himself upon the unprotected back of the retreating Xoranian, but he knew that any attempt of that kind would be suicidal. Arlok’s deadly tentacle would strike him down before he was halfway across the room.

He searched his surroundings with desperate eyes for anything that might serve as a weapon. Then his pulse quickened with sudden hope. There on a small table near Leah was the familiar bulk of a .45 calibre revolver, loaded and ready for use. It was included in a miscellaneous collection of other small earthly tools and objects that Arlok had apparently collected for study.

There was an excellent chance that Leah might be able to secure the gun unobserved. Gordon pressed her fingers in a swift attempt at signalling, then jerked his head ever so slightly toward the table. A moment later the quick answering pressure of Leah’s fingers told him that she had understood his message. From the corner of his eye Gordon saw Leah’s other hand begin cautiously groping behind her for the revolver.

Then both Gordon and Leah froze into sudden immobility as Arlok faced them again from beside an apparatus slightly reminiscent of an earthly radio set. Arlok threw a switch, and a small bank of tubes glowed pale green. A yard-square plate of bluish-gray metal on the wall above the apparatus glowed with milky fluorescence.

“It is easy to penetrate the barrier with light waves,” Arlok explained. “That is a Gate that can readily be opened from either side. It was through it that we first discovered your Earth.”