Once again the object spoke, and once again it said slowly, "I am the Space Ranger!"

Hennes's lips curved in cold ferocity as he fired.

The projectile left the muzzle, raced squarely at the object of smoke, reached it, and stopped. It stopped instantaneously, without touching the body that was still one quarter of an inch beyond its final penetration. Even the concussion of collision was not carried beyond the force-shield barrier which absorbed all the projectile's momentum, converting it into a flare of light.

That flare of light was never seen. It was drowned out in the intense blaze that was the blaster projectile exploding into energy as it stopped with no surrounding matter to shield the blast of light. It was as though a pin-sized sun existed in the room for a tiny fraction of a second.

Hennes, with a wild yell, threw his hands to his eyes as though to protect them against a physical blow. It was too late. Minutes later, when he dared open his eyelids, his aching, burning eyes could tell him nothing. Open or closed, he saw only red-studded blackness. He could not see the Space Ranger whirl into motion, pounce upon his boots, search their pockets with flying fingers, break the door's magnetic circuit, and slip out of the room seconds before the inevitable crowd of people with their confused cries of alarm had begun to gather.

Hennes's hand still covered his eyes when he heard them. He called, "Get the thing! Get him! He's hi the room. Tackle him, you Mars-forsaken, black-booted cowards."

"There's no one in the room," half-a-dozen voices called, and someone added, "Smells like a blaster, though."

A firmer, more authoritative voice said, "What's wrong, Hennes?" It was Dr. Silvers.

"Intruders," said Hennes, shaking in frustration and wrath. "Doesn't anyone see him? What's the

matter with all of you? Are you- " He couldn't

say the word. His blinking eyes were watering and blurred light was just beginning to make its way into them again. He couldn't say "blind."

Silvers asked, "Who was the intruder? Can you describe him?"

And Hennes could only shake his head helplessly. How could he explain? Could he tell them of a nightmare of smoke that could speak and against which a blaster bullet could only explode prematurely and without damage except to the man who sped it on its way?

Dr. James Silvers made his way back to his room in dull gloom. This disturbance that had routed him out of his room before he had completed preparation for bed, this aimless running about of men, the tongue-tied lack of explanation on the part of Hennes, all were to him nothing but a series of pinpricks. His eyes were fixed on tomorrow.

He had no faith in victory, no faith in the efficacy of any embargo. Let the food shipments stop. Let even a few on Earth find out why, or, worse still, invent their own theories therefor, and the results might be more frightful than any mass poisoning.

This young David Starr expressed confidence, but so far his actions inspired none in himself. His story of a Space Ranger was a poorly calculated one, fit only to arouse the suspicions of men such as Hennes and bringing him almost to his death. It was fortunate for the youngster that he, Silvers, had arrived at the proper time. Nor had he explained the reasons for such a story. He had merely expounded his plans for leaving the city and then secretly returning. Yet when Silvers had first received Starr's letter, brought by the little fellow, the one that called himself Big-man in tremendous defiance of the truth, he had quickly checked with Council headquarters on Earth. It had confirmed that David Starr was to be obeyed in all particulars.

Yet how could such a young man____________________

Dr. Silvers halted. That was strange! The door to his room, which he had left ajar in his haste, was still ajar, but no light shone out into the hall. Yet he had not put it out before leaving. He could remember its glow behind him as he had hastened down the hall toward the stairs.

Had someone put it out for him on some strange impulse toward economy? It seemed hardly likely.

There was no sound within the room. He drew his blaster, threw the door open, and stepped firmly to where he knew the light switch to be located.

A hand dropped over his mouth.

He squirmed, but the arm was a large and muscular one, and the voice in his ear was familiar.

"It's all right, Dr. Silvers. I just didn't want you to give me away by yelling in surprise."

The arm dropped away. Dr. Silvers said, "Starr?''

"Yes. Close the door. It seemed your room would be the best hiding place while the search goes on. In any case, I must speak to you. Did Hennes say what had happened?"

"No, not really. Were you involved in that?"

David's smile was lost in the darkness. "In a way, Dr. Silvers. Hennes was visited by the Space Ranger, and in the confusion I was able to reach your room with no one, I hope, having seen me."

The old scientist's voice rose despite himself. "What are you saying? I am in no mood for jokes."

"I am not joking. The Space Ranger exists."

"That will not do. The story did not impress Hennes and I deserve the truth."

"It impresses Hennes now, I am sure, and you will have the truth when tomorrow is done. Meanwhile, listen to me. The Space Ranger, as I say, exists, and he is our great hope. The game we play is a rickety one and though I know who is behind the poisoning, the knowledge may be useless. It is not a criminal or two, intending to gain a few millions by colossal blackmail, that we face, but rather a well-organized group that intends to gain control of the entire Solar System. It can carry on, I am convinced, even if we pick off the leaders, unless we learn enough of the details of the conspiracy to stop its workings cold."

"Show me the leader," said Dr. Silvers grimly, "and the Council will learn all necessary details."

"Never quickly enough," said David, just as grimly. "We must have the answer, all the answer, in less than twenty-four hours. Victory after that will not stop the death of millions upon Earth."

Dr. Silvers said, "What do you plan then?"

"In theory," said David, "I know who the poisoner is and how the poisoning was accomplished. To be met with anything but a flat denial on the part of the poisoner I need a bit of material proof. That I will have before the evening is over. To gain from him, even then, the necessary information, we must break his morale completely. There we must use the Space Ranger. Indeed, he has begun the process of morale-cracking already."

"The Space Ranger again. You are bewitched by this thing. If he does exist, if this is not a trick of yours in which even I must be a victim, who is he and what is he? How do you know he is not deceiving you?"

"I can tell no one the details of that. I can only tell you that I know him to be on the side of humanity. I trust him 'as I would myself, and I will take full responsibility for him. You must do as I say, Dr. Silvers, in this matter, or I warn you we will have no choice but to proceed without you. The importance of the game is such that even you may not stand in my way."

There was no mistaking the firm resolution of the voice. Dr. Silvers could not see the expression of David's face in the darkness, but somehow he did not have to. "What is it you wish me to do?"

"Tomorrow noon you will meet with Makian, Hennes, and Benson. Bring Bigman with you as a personal bodyguard. He is small, but he is quick and knows no fear. Have the Central Building protected by Council men, and I would advise that you have them armed with repeater blasters and gas pellets just in case. Now remember this, between twelve-fifteen and twelve-thirty leave the rear entrance unguarded and unobserved. I will guarantee its safety. Show no surprise at whatever happens thereafter."