“And that, gentlemen,” said the Secretary of War, “is the situation. Arvania has stolen the Ziegler plans and formulae. With their acquisition it becomes the most powerful nation on earth. The Ziegler plans are at present in the Arvanian Embassy, but they will be smuggled out of the country soon. Within a month of their landing in Arvania, war will be declared against us. That means”--he glanced at the tense faces around the conference table--”that we have about three months to live as a nation--unless we can get those plans!”

There was a hushed, appalled silence, broken at last by General Forsyte.

“Nonsense! How can a postage-stamp country like Arvania really threaten us?”

“The day has passed, General,” said the Secretary, “when a nation’s power is reckoned by its size. The Ziegler heat ray is the deadliest weapon yet invented. A thousand men with a dozen of the ray-projectors can reduce us to smoking ruins while remaining far outside the range of our guns. No! I tell you that declaration of war by Arvania will be followed by the downfall of the United States inside of three months!”

Again the hushed, strained silence descended over the conference table, while one white-faced man gazed at another and all speculated on the incredible possibility of a world in which there was no United States of America.

“We must get the plans,” nodded Forsyte, convinced at last. “But how? March openly on the Arvanian Embassy?”

“No, that would be declaration of war on our part. The World Court, which knows nothing of the Ziegler plans, would set the League at our throats.”

“Send volunteers unofficially to raid the place?”

“Impossible. There is a heavy guard in the Arvanian Embassy; and I more than suspect the place bristles with machine guns.”

“What are we to do?” demanded Forsyte.

The Secretary seemed to have been waiting for that final question.

“I have had an odd and desperate plan submitted me from an outside source. I could not pass it without your approval. I will let you hear it from the lips of the planner.”

He pressed a buzzer. “Bring Mr. Winter in,” he told his secretary.

The man who presently appeared in the doorway was an arresting figure. A man of thirty-odd with the body of an athlete, belied somewhat by the pallor of an indoor worker, with acid stained, delicate hands offset by forearms that might have belonged to a blacksmith, with coal black hair and gray eyes so light as to look like ice-gray holes in the deep caverns of his eye-sockets. This was Thorn Winter.

“Gentlemen, the scientist, Mr. Winter,” announced the Secretary. “He thinks he can get the Ziegler plans.”

Thorn Winter cleared his throat. “My scheme is simple enough,” he said tersely. “I believe I can walk right into the Embassy, get the plans--and then walk right out again. It sounds kind of impossible, but I think I can work it by making myself invisible.”

“Invisible?” echoed Forsyte. “Invisible!”

“Precisely,” said Thorn in a matter-of-fact tone. “I have just turned out a camouflage which is the most perfect yet discovered. It was designed for application to guns and equipment only. I’d never thought of trying to cover a human body with it, but I am sure it can be done.”

“But ... invisible...” muttered Forsyte, glancing askance at Winter.

“There’s no time for argument,” said the Secretary crisply. “The question is, shall we give this man permission to try the apparently impossible?”

All heads nodded, though in all eyes was doubt. The Secretary turned to the scientist.

“You are aware of the risk you run? You realize that if you are caught, we cannot recognize you--that we must disclaim official knowledge of your work, and leave you to your fate?”

Thorn nodded.

“Then,” said the Secretary, his voice vibrant, “yours is the mission. And on your effort hangs the fate of your country. Now--what help will you require?”

“Only the assistance of one man,” said Thorn. “And, since secrecy is vital, I’m going to ask you, sir, to be that man.”

The Secretary smiled; and with that smile he seemed to be transformed from a great leader of affairs into a kindly, human individual. “I am honored, Mr. Winter,” he said. “Shall we go at once to your laboratory?”

In the great laboratory room, the Secretary glanced about almost uneasily at the crowding apparatus that was such an enigma to one untrained in science. Then his gaze returned to Winter’s activities.

Thorn was carefully stirring fluids, poured drop by drop from various retorts, in a mixing bowl. All the fluids were colorless; and they combined in a mixture that had approximately the consistency of thin syrup. To this, Thorn added a carefully weighted pinch of glittering powder. Then he lit a burner under the bowl, and thrust into the mixture a tiny, specially constructed thermometer.

“You can really make yourself invisible?” breathed the Secretary.

“I can,” said Thorn, “if the blisters don’t upset my calculations by making my body surfaces too moist for this stuff to stick to. I’m going to have you paint me with it, you see, and it was never intended to cover flesh.”

He regulated the burner anxiously, and then began to take off his clothes.

“Ready,” he said at last, glancing at the thermometer and turning off the burner. He stood before the wondering Secretary, a fine, muscular figure. “Take this brush and cover me with the stuff. And be sure not to miss any of me!”

And then the Secretary saw why Thorn had said the colorless paint was never intended to be applied to human flesh. For it was still seething and smoking in the cauldron.

“Good heavens!” he said. “Don’t you want to wait till it cools a little?”

“Can’t,” said Thorn. “It has to be applied hot or it loses its flexibility.”

The Secretary dipped the brush and began to paint the naked flesh of the scientist. Not a quiver touched that flesh as an almost microscopically thin, colorless layer formed into a film after the brush strokes. But the Secretary’s fingers shook a little.

“My God, man!” he said finally. “Doesn’t it hurt?”

“It’s a little like being boiled in oil,” replied Thorn grimly. “Outside of that it’s all right. Hurry, before the stuff gets too cool.”

The clinging thin shell covered him to his chest, then to his throat. At that point he reached into a drawer in a workbench beside him and drew out two small, hollow hemispheres of glass. These he cupped over his eyes.

“What are those for?” asked the Secretary.

“So my eyes can be covered with the film. If they weren’t, I’d present the somewhat remarkable spectacle of a pair of disembodied eyes walking down the street.”

Painfully, agonizingly, the hot film was applied to throat and face; over the glass spheres that cupped around the eyes; over a tight leather cap covering the scientist’s hair; and over a sort of football nose-guard which extended down an inch below the end of Thorn’s nose in a sort of overhanging offset that would allow him to breathe and still keep his nostrils hidden. The Secretary stepped back.

Before him stood a figure that looked not unlike a glazed statue of a man. The effect was that of a body encased in clear ice--and like clear ice, the encasing shell sparkled and glittered radiantly in the sunlight that poured in at the windows.

Thorn moved. His glazed arms and legs and torso glistened with all the colors in the spectrum; while under the filmed bulges of glass his eyes looked as large as apples. The Secretary felt a chill of superstitious fear as he gazed at that weird and glittering figure with its enormous glazed eyes.

“But you aren’t invisible,” he said at length.

“That comes now,” said Thorn, walking ahead of the Secretary while on the ceiling above him danced red and yellow and blue rainbows of refracted light.

He stepped onto a big metal plate. Suspended above was a huge metal ring, with its hole directly over the spot on which he stood.

“Soft magnets,” explained Thorn. “As simply as I can put it, my process for rendering an object invisible is this: I place the object, coated with the film, on this plate. Then I start in motion the overhead ring, creating an immensely powerful, rapidly rotating magnetic field. The rotating field rearranges the atoms of this peculiarly susceptible film of mine so that they will transmit light rays with the least possible resistance. It combs the atoms into straight lines, you might say. With that straight-line, least-resistance arrangement comes invisibility.”

“I don’t quite see--” began the Secretary.

“Refraction of light,” said Thorn hurriedly. “The light rays strike this film, hurtle around the object, it coats--at increased speed, probably, but there are no instruments accurate enough to check that--and emerge on the other side. Thus, you can look at a body so filmed, and not see it: your gaze travels around it and rests on objects in a straight line behind it. But you’ll see for yourself in a moment. Pull that switch, there, will you? And leave it on for two full minutes after you have ceased to see me.”

Straight and tall, a figure encased in shimmering crystal, the scientist stood on the metal plate. Hesitant, with the superstitious dread growing in his heart, the Secretary stood with his hand on the switch. That hand pulled the switch down...

Soundlessly the overhead metal ring began to whirl, gathering speed with every second. And then, though he had known in advance something of what was coming, the Secretary could not suppress a shout of surprise.

The man before him on the metal plate was vanishing.

Slowly he disappeared from view--slowly, as an object sinking deeper and deeper into clear water disappears. Now the face was but a white blob. Now the entire body was but a misty blur. And now a shade, a wavering shadow, alone marked Winter’s presence.

The Secretary could not have told the exact instant when that last faint blur oozed from sight. He only knew that at one second he was gazing at it--and at the next second his eyes rested on a rack of test-tubes on the wall beyond the plate.

He looked at his watch. Sweat glistened in tiny points on the hand that held the switch. It was all so like death, this disappearance--as if he had thrown the switch that electrocuted a man.

The specified two minutes passed. He cut off the power. The great ring lost speed, stopped whirling. And on the plate was--nothing.

At least it seemed there was nothing. But a moment later a deep voice sounded out: “I guess I’m invisible, all right, according to the expression on your face.”

“You are,” said the Secretary, mopping his forehead, “except when you speak. Then I have the bizarre experience of seeing glimpses of teeth, tongue and throat hanging in mid-air. I’d never have believed it if I hadn’t witnessed it myself! That paint of yours is miraculous!”

“A little complicated, but hardly miraculous. It has a cellulose base, and there is in it a small per cent of powdered crystal--but the rest I’ll keep locked in my brain alone till my country has need of it.”

The glimpses of teeth and tongue and throat ceased. In spite of himself, the Secretary started as an unseen hand touched his shoulder.

“Now,”--there was ringing resolution in the deep voice--”for the Arvanian Embassy. Please drive me there--and be as quick as you can about it. I can’t last very long with this film sealing most of the pores of my body.”

The Secretary started for the laboratory door. Beside him sounded the patter of bare feet. He opened the door and walked into the hallway. Behind him, apparently of itself, the door clicked shut; and the footsteps again sounded beside him.

The Secretary walked to the curb where his limousine waited. His chauffeur jumped out and opened the door. The Secretary paused a moment, one foot on the running board, to draw a cigar from his pocket and light it. During that moment the car pressed down on that side, and as suddenly rocked back up again.

The chauffeur stared wide-eyed at his employer.

“Did you do that, sir?” he asked.

“Do what?” said the Secretary.

“Push down on the running board with your foot.”

“Of course not,” said the Secretary, his eyebrows raising. “You could have seen my leg move if I had. But why do you ask?”

“It felt like somebody got into this car,” mumbled the man.

“Did you see anybody get in?” said the Secretary with a shrug. And, shaking his head, with a fuddled look in his eyes, the chauffeur turned away and got into the driver’s seat.

The Secretary glanced at the rear seat. On the far side, the cushion was heavily depressed. He sat on the near side, feeling his knee strike another, unseen knee.

“Drive to the Bulgarian Embassy,” he told his man.

Up Sixteenth Street the car swung, past the various embassies which looked more like palatial private villas than offices of foreign nations. Toward the end of the line, a smaller building than most of the others, was the Arvanian Embassy. Next to it was the Bulgarian.

The car stopped in front of the Bulgarian Embassy, and the Secretary got out. Again he paused, while the chauffeur held the door open, to hold a match to his cigar. Again the car sagged down on that side, and slowly swayed up again.

“Hey--” said the chauffeur. But meeting the Secretary’s calmly inquiring gaze, he stopped. Scratching his head, he went back to the wheel, while the Secretary walked toward the building entrance.

Behind him, moving on soundless bare feet along the sidewalk, Thorn Winter hastened, cloaked in invisibility, toward the Arvanian Embassy--and the plans that spelled America’s destruction if they remained in Arvanian hands.

The embassy building was a three-storied oblong house of white stone topping a terrace that started its climb from the sidewalk of Sixteenth Street. The doors at the head of the wide stone staircase were of bronze; and they were closed, and, Thorn surmised, efficiently barred. The windows at front and sides were also closed, in spite of the warmth of the sunny spring afternoon.

Beside the building, leading up in a short steep hill, was the driveway. Up this Thorn started. The front of the house was hopelessly barred; but at the rear entrance there might be a chance.

Up the driveway, then, he walked, a little startled at the fact that he cast no shadow--feeling as a ghost might feel. The pavement was hot to his thinly filmed feet. A little dubious as to the effect of heat on the vital shell that hid him, he stepped off into the cool grass beside the drive; and came soon to the rear of the embassy.

There was no porch or veranda, simply two stone steps leading up to a stout oak door which opened onto the embassy kitchens. From behind this door came the sound of crockery and the hum of voices. The Arvanian chef evidently was preparing afternoon tea.

Walking boldly to the very steps, Thorn began the vigil that should end when someone came in or out of that door, allowing him to slip inside the building before the portal was barred shut again.

For nearly half an hour Thorn stood there before something happened that at once helped him, and, at the same time, nearly proved his undoing.

A light delivery van sped up the driveway. The wheels stirred up a cloud of dust. It was a very small cloud of very fine dust. Thorn at first thought nothing of it, because he was so engrossed in the conviction that here ought to be provided an entrance into the house.

The truck driver got out, took a crate from the body of the van, and went with it to the back door. After a moment of waiting, the door opened. Thorn noticed that it was opened very cautiously, only an inch or so. He caught a glimpse of a heavy chain stretched across the inch opening, and saw a strip of bearded, resolute face.

The door was unchained. The driver walked in, while the door stood open. Thorn started to glide in after him...

Mere chance made him glance at a window near the door. This window framed another bearded, resolute face. And the eyes in that face were like saucers as they stared full at Thorn!

For an instant Thorn knew icy fear. His invisibility! Had something happened to strip him of that concealing mantle? But what could have happened?

He glanced down at himself and saw the reason for the guard’s saucer-eyed expression.

A little of the light cloud of dust stirred up by the truck wheels had settled over him and clung to the encasing shell. As he moved, these dust specks moved. The effect to the staring guard, Thorn realized, must be that of seeing a queer, fine dust column moving eccentrically over a grassy lawn where no dust column had any business to be.

Quickly Thorn moved toward the garage, with the eyes of the amazed guard following him. The scientist was savage at the delay; but it was vital that he rid himself of that clinging dust.

Behind the garage he broke off a feathery spray from a vine, and stroked it lightly over himself. That, too, presented a curious spectacle: a leafy branch suddenly detaching itself from the parent vine and dancing here and there in mid-air.

When the all-important task was done, Thorn raced back to the rear doorway. By great good luck it was still open. He stole in, just making it as the truck driver, staggering under a load of empty crates, came up the cellar stairs and went out to his truck.

Thorn drew a deep breath. He was inside the Arvanian Embassy. The place was a three-storied stone trap in which, if the slightest slip revealed him to its tenants, he would surely meet his death. But, anyway, he was inside! And the threatening Ziegler plans waited somewhere near at hand for him to find and take!

Even had Thorn not known in advance that trouble was brewing, he could have surmised that something sinister was being hatched in the Arvanian Embassy. For, in this big sunny kitchen five men lounged about in addition to the white-coated chef and his beardless stripling of an assistant. And each of the five had a holster strapped openly over his coat with the butt of an automatic protruding in plain sight.

Thorn looked about. Across from the great range, beside which he was standing and holding his breath for fear some one of the seven men should become aware of his presence, was the door leading to the front part of the house. He started toward that door, walking on tiptoe. A shudder crept up his spine as he tiptoed across the floor directly in front of the armed guards who would have shot him down without compunction could they have seen him. He was not yet used to his invisibility; knowing himself to be substantial, feeling his feet descend solidly on the floor, he still could hardly credit the fact that human eyes could not observe him.

He got to the door. He put out his hand to open it, then realized just in time that he could not do that. A door stealthily opening and closing again, with no apparent hand to manipulate it? Such a spectacle would start a riot!

In a frenzy of impatience, he stood beside the door, waiting till someone else should swing it open. And in a moment it chanced that the stripling assistant chef came toward him with a tray. The boy pushed the swinging door with his foot, and walked into the butler’s pantry. After him, treading almost on the lad’s heels, came Thorn.

The boy sat the tray down, and turned to reach into an upper shelf. The space in the pantry was constricted, and he turned abruptly. The result was that he suddenly drew back as though a hot iron had seared him, and went white as chalk. Then he dashed back into the kitchen.

“A hand!” Thorn heard him gibbering in Arvanian. “A hand! I touched it with mine! Something horrible is in there!”

With his heart pounding in his throat, Thorn leaned close to the swing-door to hear what happened next. Would there be a rush for the butler’s pantry? An investigation? He eyed the farther door--the dining room door. But he dared not flee through that save as a last resort. In the dining room sounded voices; and again the sight of a door opening and closing of itself would lead to uproar.

“A hand?” he heard one of the guards say in the kitchen. “An unseen hand? Thou art empty in the head, young Gova.”

There followed some jeering sentences in colloquial Arvanian that were too idiomatic for Thorn’s knowledge of the language to let him understand. A general guffaw came from the rest; and, as no move was made toward the pantry, Thorn decided he was saved for another few moments.

Gasping, he raised his hand to wipe the perspiration off his forehead, then realized there was no perspiration there. His film-clogged pores could exude nothing; he had only the sensation of perspiring.