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Dr. Bird nodded agreement and with a sharp command to his men Bolton broke into a run. Not a shot was fired as they approached, and the front door gave readily to Bolton's touch. At it opened there came a grating sound from the roof followed by the whir of a propeller. Dr. Bird ran out of the building and glanced up.

"A helicopter!" he cried. "They were expecting us and have escaped!"

He drew his pistol and fired ineffectually at the great bird-like ship which was rising almost noiselessly into the air. He cursed and turned again to the building.

Bolton still stood in the room which they had first entered. His flashlight showed it to be empty, but from under a door on the opposite side a line of dull red light glowed evilly. With his pistol ready in his hand, Bolton approached the door on hands and knees. When he reached it he threw his shoulder against it and dropped flat to the floor as the door swung open. No shot greeted him, and he stared for a moment and then rose to his feet.

"Nothing in here but some glass statues," he announced.

Dr. Bird followed him into the room. As he looked at what Bolton had called glass statues he gasped and shielded his eyes.

"God in Heaven!" he ejaculated. "Those were living men!"

Before them were three men or what had been three men. All stood in strained attitudes with a look of horror frozen on their faces. The thing that made the spectators shudder was that their bodies had, by some diabolical method, been rendered semi-transparent. The dull red light which suffused the room emanated from the three bodies. Dr. Bird examined them closely, being careful not to touch them.

"The identity of my treacherous assistant is known," he said grimly as he pointed at the middle figure. "It was Gerond. What is this?"

He took an envelope from the hand of the middle figure and opened it. A sheet of paper fell out and he picked it up and read it.

"My dear Mr. Bolton," ran the note. "Your methods of tracing and picketing my headquarters are so crude as to be almost laughable. This base has served its purpose and we were ready to abandon it in any event, but I couldn't resist the temptation to let you almost nab us. The three men whom you will find here are agents who failed in their duty. If you are interested in learning the method of their execution, you might take to heart the words of your colleague, Dr. Bird: 'The clue lies in those windows.'"

Carnes glanced at the windows and gave a cry of surprise. The glass was opaque, as had been the glass in the doctor's laboratory and the glass in the infirmary at Atlanta. The fogging however, was much more pronounced, and the opaque glass gave faintly the same red effulgence which came from the three bodies.

"What does it mean, Doctor?" he asked.

"I don't know, Carnes," said Dr. Bird slowly. "I foresee that I am going to have to do a great deal of work on short wave-lengths soon. It is doubtless the effect of some modification of the black lamp which has done it. Look out!"

He leaped to one side as he spoke, drawing Bolton and Carnes with him. A panel in the side of the wall opposite the doorway had slid silently open and through the opening poured out a beam of fiery red. Full on the three bodies it fell, and then spread out to fill the room. Dr. Bird had drawn the two nearest men out of the direct beam, but one of the secret service men stood full in its path. In the excitement of entering he had dropped his vitrilene shield and the livid ray fell full on his defenceless body. As they watched an expression of horror spread over his face and he strove to move to one side, but he was held helpless. Slowly he stiffened; and, as the ray bored through him, his body became semi-transparent and the same dull red glow which emanated from the three bodies they had found began to shine forth from him. Bolton strove to break from the doctor's grasp and rush to the rescue but Dr. Bird held him with a grip of iron.

"Too late," he said grimly. "Chalk up another murder to the arch fiend who has committed the others. I don't know the nature of that ray and vitrilene may not be an adequate defence against its full force. We had better get out of here and attack the place from the rear."

Carefully edging their way around the sides of the room, the five men made their way out through the door. Dr. Bird slammed the door shut behind him and led the way out of the building and around to the rear. A door loomed before them and he cautiously tried it. It gave to his touch and he entered. As he set his foot on the threshold a terrific explosion came from the interior of the building.

"Run!" he shouted as he led the way in retreat. "If that is a radite explosion it will act for several seconds!"

From a safe distance they watched. One corner of the building had been torn off by the force of the explosion, and as they watched the rest of the building gradually collapsed and sank into a pile of ruins.

"They had planned on a visit from us all right," said Dr. Bolton grimly. "They had a surprise for us any way we jumped. If we went in the front door, that devil's ray was to finish us, and if we went in the back door the whole place was arranged to blow up as we entered. I only hope that Stanesky thinks that he has got us all and doesn't expect an attack on his next base in the morning. If he doesn't, I think we may give him a rather unpleasant surprise. Of course, that lamp is smashed into atoms and buried under the debris, but I don't know what other devil's contraptions that ruin holds. Bolton, have your men picket it and allow no one near until I get back. I've got to get to a telephone and get a couple of tanks from Meade and a plane or two from Langley Field."

Two tanks made their way slowly across country. The front of each tank was protected by a heavy sheet of vitrilene, while from the turrets of the tanks projected the wicked looking muzzles of thirty-seven millimeter guns. Overhead two airplanes from Langley Field soared, scouting the country. Dr. Bird and Carnes rode in the leading tank.

"It ought to be somewhere near here, unless Karuska lied," said Carnes as he swept the country with a pair of binoculars.

"He didn't lie," returned Dr. Bird. "It was his subconscious mind that spoke and it never lies. He spoke of the gun emplacement as being in a swamp and I have a strong idea that it is submersible. Of course, it is bound to be well camouflaged, both from land and from air observation."

The planes circled around again and again, quartering the air like a pair of well-trained bird dogs will quarter a hunting field. First high and then low they swooped back and forth, the tanks lumbering slowly along in the same direction. Presently the occupants of the leading tank saw one of the planes bank sharply and swing around. It dropped to an altitude of only a few hundred feet and turned and went back over the ground it had just crossed.

"I believe that fellow sees something!" exclaimed Carnes.

As he spoke, three green Very lights came from the cockpit of the plane. The tank driver gave a grunt of satisfaction and turned the nose of his vehicle in that direction. The second tank followed.

Hardly had they turned in the new direction before the ground began to get soft under their tracks and the heavy vehicles began to sink. The driver of the Doctor's tank forced it ahead, but the tank sank deeper in the mire until water flowed in around the feet of the occupants.

"I reckon we'll have to get out and walk pretty soon, Doctor," said the driver.

Dr. Bird grunted in acquiescence. The tank made its way forward a few yards before the engine sputtered and died. The second tank stopped when the first one did, fifty yards behind it. Donning vitrilene helmets and taking vitrilene shields in their hands, the crews of both tanks climbed out into the waist-deep water and gathered around the Doctor for orders.

"Form a skirmish line at ten-pace intervals and cross the swamp," he directed. "We may meet with no opposition, but if there is, the more scattered we are, the safer we will be. You all have hand grenades as well as your rifles?"

A murmur of assent answered him and the line formed and started across the swamp. They had gone perhaps a hundred yards when three red lights came from one of the planes circling overhead.

"Down!" cried the doctor, dropping to his knees in the muck.

Four hundred yards ahead of them a concrete platform emerged from the marsh and rose slowly into the air. It was roofed with a dome of what looked like plate glass, but which the doctor shrewdly suspected was vitrilene. When the base of the platform was two-feet above the level of the water the dome slid silently aside disclosing two men bending over a tiny gun. Dr. Bird leveled his binoculars.

"That's the Breslau gun model that was stolen as sure as I'm a foot high!" he cried. "They must have made some miniature shells and be planning to fire it."

Slowly a pall of intense blackness rose from the marsh and enveloped the platform and hid it from view. A whining noise came from overhead, and then a crash like a thunderbolt. The blast of the explosion threw the attackers face down in the swamp, and when they arose and looked back there was merely a gaping hole where the leading tank had been. The second tank suddenly seemed to rise in the air and fly into millions of tiny fragments, and a second thunderous blast sent them again to their knees.

"Radite!" bellowed Dr. Bird to Carnes. "Imagine the effect if that had been a full charge fired from a completed Breslau gun! Watch the planes, now. I think they are going to drop a few eggs on them."

The black mist cleared as if by magic and the platform was in plain view. The big glass dome rolled back into place as the two planes swept over at an elevation of two thousand feet. From each one a small black cigar-shaped object was released and fell in a long parabola toward the earth. The glass dome which had been closing over the gun platform rolled quickly back and a long beam of intense blackness pierced the heavens. First one and then the other of the falling bombs disappeared from view into it, and then the black column faded from view. The two bombs fell with increasing speed but the dome closed over the platform before they struck. The two hit the dome at almost the same instant and instead of the blinding crash they expected, the watchers saw the bombs rebound from the dome and fall harmlessly into the water.

"Stymied!" muttered the doctor. "I wonder what other properties that confounded lamp has."

He resumed his advance, Carnes and the soldiers keeping abreast of him. When they were within two hundred yards of the platform it rose again and the transparent dome rolled back. A beam of black shot forth over the swamp, searching them out and hiding them from view. First one and then another felt the effects of the black beam; but the vitrilene which the Doctor had provided stood them in good stead, and, aside from a slight shortening of their breath, none of the attackers felt any the worse.

"Come on, men!" cried the Doctor as his athletic figure plowed forward through the breast-deep water. "That is their worst weapon and it is harmless against us!"

Cheering, they fought their way toward the platform. It sunk for a moment and then rose again. As the dome swung back a sharp crackle of machine-gun fire sounded and the water before them was whipped into foam by the plunging bullets. One of the soldiers gave a sharp cry and slumped forward into the water.

"Fire at will!" shouted the lieutenant in command.

A crackle of rifle fire answered the tattoo of the machine-gun, and the sharp ping of bullets striking on the dome could be plainly heard. An occasional shot kicked up a spurt of white dust from the concrete, but the machine-gun kept up a steady rattle of fire and the soldiers kept their heads almost at the level of the water. There came the roar of an airplane motor, and one of the planes swept over the platform, a hundred yards in the air, with two machine-guns spraying streams of bullets onto the platform. Two men abandoned their machine-gun and crouched under the partially folded-back dome as the second plane swept over, and Dr. Bird took advantage of the lull to advance his party a few yards nearer. Again the defenders of the platform rushed to their gun, but the first plane had turned and swooped down with both guns going, and again they were forced to take shelter while the Doctor and his force made another advance.

The second plane had turned and followed the first, but the defenders had had enough. The transparent dome closed over them and the platform sank into the marsh. With a shout, Dr. Bird led the way forward again.

The attackers were within a hundred yards of the platform when it again rose above the surface of the water. The guns had disappeared, but in their place stood an airship. It was a small affair with stubby wings above which were two helicopter blades revolving at high speed. No sound of a motor could be heard.

The transparent dome rolled back and like a bullet the little craft shot into the air, followed by a futile volley from the soldiers. Hardly had it appeared than the two airplanes bore down on it with machine-guns going. The helicopter paid no attention to them for a moment, and then came a puff of smoke from its side. The leading plane swerved sharply and the helicopter fired again. The leading plane maneuvered about, trying to get a machine-gun to bear, while the second plane climbed swiftly to get above the helicopter and pour a deadly stream of fire down into it. It gained position and swooped down to the attack, but another puff of smoke came from the side of the helicopter and there was a thunderous report and a blinding flash in the sky. As the smoke cleared away, no trace of the ill-fated plane could be seen. The helicopter hung motionless in the air as though daring the remaining plane to attack.

The plane accepted the challenge and bore down at full speed on the stranger. Again came a puff of smoke, but the plane swerved and an answering shot came from its side. It was above the helicopter, and the shell which missed its mark plunged to the ground. When it struck there came a roar and a flash and the whole earth seemed to shake. The helicopter shot upward into the air and forward, both its elevating fans and its propellers whirling blurs of light. The airplane followed at its sharpest climbing angle, but was helpless to compete with its swifter climbing rival.

"He's got away!" groaned Carnes.

"Not yet, old dear!" cried the Doctor hopping with excitement. "He isn't safe yet. I never told you, but one Breslau gun had been made and it is on that plane. It has deadly accuracy and is good for fifteen miles. That's Lieutenant Dreen at the controls and Mason at the gun."

As he spoke the plane swung around and made a half loop. For a few yards it flew upside down and then whirled swiftly. As it turned there came a sharp report and a puff of smoke from its rear cockpit. High above, the helicopter had ceased climbing and hovered motionless. As the plane fired, the helicopter shot forward like an arrow from a bow, and thereby spelled its doom. Not for nothing did Captain Mason bear the title of the best aerial gunner in the Air Corps. He had foreseen what the action of his opponent would be and had allowed for just such a move. Far up in the sky came a blinding flash and a cloud of smoke. When the smoke cleared the sky was empty, except for a little scattered debris falling slowly to the ground.

And that's that!" exclaimed Dr. Bird as he finished his examination of the underground laboratory with which the gun platform connected. "The lamp has gone to glory with Breslau's gun model and two of the best brains of the Young Labor party. I am sure that Stanesky was one of those two men. I wish the whole gang had been on board."

"Don't you think that this is the end of it, Doctor?" asked Carnes.

"No, Carnes, I don't. We know that the real brains of this outfit is Saranoff, and Saranoff is still alive. He probably won't try to use his black lamp again, because I will have a defence against it in a short time, now that I have seen it in action, but he'll try something else. The whole object of life to a loyal citizen of Bolshevikia is to reduce the whole world to the barbarous level in which they hold Russia, and they will spare no pains or effort to accomplish it. The greatest obstacle to their success at present is the President of the United States. He is loved and respected by the whole world, and if he is spared he will forge the world into a great machine for the preservation of peace and universal good will. That would be fatal to Bolshevikia's plans, and they will spare no effort to remove him. By the grace of God, we have saved him from harm so far, but until we remove Saranoff permanently from the scene, I will never feel safe for him."

"What do you suppose they'll try next, Doctor?"

"That, Carnes, time alone will tell."



When Roger Strang found that someone was killing his son--killing him horribly and often--he started investigating. He wasn't prepared to find the results of another investigation--this time about his own life.

It was the second time they tried that Roger Strang realized someone was trying to kill his son.

The first time there had been no particular question. Accidents happen. Even in those days, with all the Base safety regulations and strict speed-way lane laws, young boys would occasionally try to gun their monowheels out of the slow lanes into the terribly swift traffic; when they did, accidents did occur. The first time, when they brought David home in the Base ambulance, shaken but unhurt, with the twisted smashed remains of his monowheel, Roger and Ann Strang had breathed weakly, and decided between themselves that the boy should be scolded within an inch of his young life. And the fact that David maintained tenaciously that he had never swerved from the slow monowheel lane didn't bother his parents a bit. They were acquainted with another small-boy frailty. Small boys, on occasion, are inclined to fib.

But the second time, David was not fibbing. Roger Strang saw the accident the second time. He saw all the circumstances involved. And he realized, with horrible clarity, that someone, somehow, was trying to kill his son.

It had been late on a Saturday afternoon. The free week-ends that the Barrier Base engineers had once enjoyed to take their families for picnics "outside," or to rest and relax, were things of the past, for the work on the Barrier was reaching a critical stage, demanding more and more of the technicians, scientists and engineers engaged in its development. Already diplomatic relations with the Eurasian Combine were becoming more and more impossible; the Barrier had to be built, and quickly, or another more terrible New York City would be the result. Roger had never cleared from his mind the flaming picture of that night of horror, just five years before, when the mighty metropolis had burst into radioactive flame, to announce the beginning of the first Atomic War. The year 2078 was engraved in millions of minds as the year of the most horrible--and the shortest--war in all history, for an armistice had been signed not four days after the first bomb had been dropped. An armistice, but an uneasy peace, for neither of the great nations had really known what atomic war would be like until it had happened. And once upon them, they found that atomic war was not practical, for both mighty opponents would have been gutted in a matter of weeks. The armistice had stopped the bombs, but hostilities continued, until the combined scientific forces of one nation could succeed in preparing a defense.

That particular Saturday afternoon had been busy in the Main Labs on the Barrier Base. The problem of erecting a continent-long electronic Barrier to cover the coast of North America was a staggering proposition. Roger Strang was nearly finished and ready for home as dusk was falling. Leaving his work at the desk, he was slipping on his jacket when David came into the lab. He was small for twelve years, with tousled sand-brown hair standing up at odd angles about a sharp, intelligent face. "I came to get you, Daddy," he said.

Roger smiled. "You rode all the way down here--just to go home with me?"

"Maybe we could get some Icy-pops for supper on the way home," David remarked innocently.

Roger grinned broadly and slapped the boy on the back. "You'd sell your soul for an Icy-pop," he grinned.

The corridor was dark. The man and boy walked down to the elevator, and in a moment were swishing down to the dark and deserted lobby below.

David stepped first from the elevator when the men struck. One stood on either side of the door in the shadow. The boy screamed and reeled from the blow across the neck. Suddenly Roger heard the sharp pistol reports. David dropped with a groan, and Roger staggered against the wall from a powerful blow in the face. He shook his head groggily, catching a glimpse of the two men running through the door into the street below, as three or four people ran into the lobby, flushed out by the shots.

Roger shouted, pointing to the door, but the people were looking at the boy. Roger sank down beside his son, deft fingers loosening the blouse. The boy's small face was deathly white, fearful sobs choking his breath as he closed his eyes and shivered. Roger searched under his blouse, trying to find the bullet holes--and found to his chagrin that there weren't any bullet holes.

"Where did you feel the gun?"

David pointed vaguely at his lower ribs. "Right there," he said. "It hurt when they shoved the gun at me."

"But they couldn't have pulled the trigger, if the gun was pointed there--" He examined the unbroken skin on the boy's chest, fear tearing through his mind.

A Security man was there suddenly, asking about the accident, taking Roger's name, checking over the boy. Roger resented the tall man in the gray uniform, felt his temper rise at the slightly sarcastic tone of the questions. Finally the trooper stood up, shaking his head. "The boy must have been mistaken," he said. "Kids always have wild stories to tell. Whoever it was may have been after somebody, but they weren't aiming for the boy."

Roger scowled. "This boy is no liar," he snapped. "I saw them shoot--"

The trooper shrugged. "Well, he isn't hurt. Why don't you go on home?"

Roger helped the boy up, angrily. "You're not going to do anything about this?"

"What can I do? Nobody saw who the men were."

Roger grabbed the boy's hand, helped him to his feet, and turned angrily to the door. In the failing light outside the improbability of the attack struck through him strongly. He turned to the boy, his face dark. "David," he said evenly, "you wouldn't be making up stories about feeling that gun in your ribs, would you?"

David shook his head vigorously, eyes still wide with fear. "Honest, dad. I told you the truth."

"But they couldn't have shot you in the chest without breaking the skin--" He glanced down at the boy's blouse and jacket, and stopped suddenly, seeing the blackened holes in the ripped cloth. He stooped down and sniffed the holes suspiciously, and shivered suddenly in the cold evening air.

The burned holes smelled like gunpowder.

"Strang, you must have been wrong." The large man settled back in his chair, his graying hair smoothed over a bald spot. "Someone trying to kill you I could see--there's plenty of espionage going on, and you're doing important work here. But your boy!" The chief of the Barrier Base Security shook his head. "You must have been mistaken."

"But I wasn't mistaken!" Roger Strang sat forward in his chair, his hands gripping the arms until his knuckles were white. "I told you exactly what happened. They got him as he came off the elevator, and shot at him. Not at me, Morrel, at my son. They just clubbed me in the face to get me out of the way--"

"What sort of men?" Morrel's eyes were sharp.

Roger scowled, running his hand through his hair. "It was too dark to see. They wore hats and field jackets. The gun could be identified by ballistics. But they were fast, Morrel. They knew who they were looking for."

Morrel rose suddenly, his face impatient. "Strang," he said. "You've been here at the Base for quite awhile. Ever since a month after the war, isn't that right? August, 2078? Somewhere around there, I know. But you've been working hard. I think maybe a rest would do you some good--"

"Rest!" Roger exploded. "Look, man--I'm not joking. This isn't the first time. The boy had a monowheel accident three weeks ago, and he swore he was riding in a safe lane where he belonged. It looked like an accident then--now it looks like a murder attempt. The slugs from the gun must be in the building--embedded in the plasterwork somewhere. Surely you could try to trace the gun." He glared at the man's impassive face bitterly, "Or maybe you don't want to trace the gun--"

Morrel scowled. "I've already checked on it. The gun wasn't registered in the Base. Security has a check on every firearm within a fifty-mile range. The attackers must have been outsiders."

Roger's face flushed. "That's not true, Morrel," he said softly, "and you know it's not true."

Morrel shrugged. "Have it your own way," he said, indifferently. "Take a rest, Strang. Go home. Get some rest. And don't bother me with any more of your fairy tales." He turned suddenly on Roger. "And be careful what you do with guns, Strang. The only thing about this that I do know is that somebody shot a pistol off and scared hell out of your son. You were the only one around, as far as I know. I don't know your game, but you'd better be careful--"

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