mouth and tapped the dottle into a nearby ash disposal unit. "And you want to pick up our pet spy?"

Senator Gonzales scowled. "Well, I'd certainly call him our prime suspect." But there was a certain lack of conviction in his manner.

Brian Taggert didn't flatly contradict the senator. "Maybe. But you know, John, there's one thing that bothers me about these accidents."

"What's that?"

"The fact that we have not one shred of evidence that points to sabotage."

In a room on the fifth floor, directly below Brian Taggert's office, a young man was half sitting, half reclining in a thickly upholstered adjustable chair. He had dropped the back of the chair to a forty-five degree angle and lifted up the footrest; now he was leaning back in lazy comfort, his ankles crossed, his right hand holding a slowly smoldering cigarette, his eyes contemplating the ceiling. Or, rather, they seemed to be contemplating something beyond the ceiling.

It was pure coincidence that the focus of his thoughts happened to be located in about the same volume of space that his eyes seemed to be focused on. If Brian Taggert and Senator Gonzales had been in the room below, his eyes would still be looking at the ceiling.

In repose, his face looked even younger than his twenty-eight years would have led one to expect. His close-cropped brown hair added to the impression of youth, and the well-tailored suit on his slim, muscular body added to the effect. At any top-flight university, he could have passes for a well-bred, sophisticated, intelligent student who had money enough to indulge himself and sense enough not to overdo it.

He was beginning to understand the pattern that was being woven in the room above—beginning to feel it in depth.

Senator Gonzalez was mildly telepathic, inasmuch as he could pick up thoughts in the prevocal stage—the stage at which thought becomes definitely organized into words, phrases, and sentences. He could go a little deeper, into the selectivity stage, where the linking processes of logic took over from the nonlogical but rational processes of the preconscious—but only if he knew the person well. Where the senator excelled was in detecting emotional tone and manipulating emotional processes, both within himself and within others.

Brian Taggert was an analyzer, an originator, a motivator—and more. The young man found himself avoiding too deep a probe into the mind of Brian Taggert; he knew that he had not yet achieved the maturity to understand the multilayered depths of a mind like that. Eventually, perhaps....

Not that Senator Gonzales was a child, nor that he was emotionally or intellectually shallow. It was merely that he was not of Taggert's caliber.

The young man absently took another drag from his cigarette. Taggert had explained the basic problem to him, but he was getting a wider picture from the additional information that Senator Gonzales had brought.

Dr. Theodore Nordred, a mathematical physicist and one of the top-flight, high-powered, original minds in the field, had shown that Einstein's final equations only held in a universe composed entirely of normal matter. Since the great Einstein had died before the Principle of Parity had been overthrown in the mid-fifties, he had been unable to incorporate the information into his Unified Field Theory. Nordred had been able to show, mathematically, that Einstein's equations were valid only for a completely "dexter," or right-handed universe, or for a completely "sinister" or left-handed universe.

Although the universe in which Man lived was predominantly dexter—arbitrarily so designated—it was not completely so. It had a "sinister" component amounting to approximately one one-hundred-thousandth of one per cent. On the average, one atom out of every ten million in the universe was an atom of antimatter. The distribution was unequal of course; antimatter could not exist in contact with ordinary matter. Most of it was distributed throughout interstellar space in the form of individual atoms, freely floating in space, a long way from any large mass of normal matter.

But that minute fraction of a per cent was enough to show that the known universe was not totally Einsteinian. In a purely Einsteinian universe, antigravity was impossible, but if the equations of Dr. Theodore Nordred were actually a closer approximation to true reality than those of Einstein, then antigravity might be a practical reality.

And that was the problem the Redford Research Team was working on. It was a parallel project to the interstellar drive problem, being carried on elsewhere.

The "pet spy," as Taggert had called him, was Dr. Konrad Bern, a middle-aged Negro from Tanganyika, who was convinced that only under Communism could the colored races of the world achieve the technological organization and living standard of the white man. He had been trained as a "sleeper"; not even the exhaustive investigations of the FBI had turned up any relationship between Bern and the Soviets. It had taken the telepathic probing of the S.M.M.R. agents to uncover his real purposes. Known, he constituted no danger.

There was no denying that he was a highly competent, if not brilliant, physicist. And, since it was quite impossible for him to get any information on the Redford Project into the hands of the opposition—it was no longer fashionable to call Communists "the enemy"—there was no reason why he shouldn't be allowed to contribute to the American efforts to bridge space.

Three times in the five months since Bern had joined the project, agents of the Soviet government had made attempts to contact the physicist. Three times the FBI, warned by S.M.M.R. agents, had quietly blocked the contact. Konrad Bern had been effectively isolated.

But, at the project site itself, equipment failure had become increasingly more frequent, all out of proportion to the normal accident rate in any well-regulated laboratory. The work of the project had practically come to a standstill; the ultra-secret project reports to the President were beginning to show less and less progress in the basic research, and more and more progress in repairing damaged equipment. Apparently, though, increasing efficiency in repair work was self-neutralizing; repairing an instrument in half the time merely meant that it could break down twice as often.

It had to be sabotage. And yet, not even the S.M.M.R. agents could find any trace of intentional damage nor any thought patterns that would indicate deliberate damage.

And Senator John Peter Gonzales quite evidently did not want to face the implications of that particular fact.

"We're going to have to send an agent in," Taggert repeated.

(That's my cue, thought the young man on the fifth floor as he crushed out his cigarette and got up from the chair.)

"I don't know how we're going to manage it," said the senator. "What excuse do we have for putting a new man on the Redford team?"

Brian Taggert grinned. "What they need is an expert repair technician—a man who knows how to build and repair complex research instruments. He doesn't have to know anything about the purpose of the team itself, all he has to do is keep the equipment in good shape."

Senator Gonzalez let a slow smile spread over his face. "You've been gulling me, you snake. All right; I deserved it. Tell him to come in."

As the door opened, Taggert said: "Senator Gonzales, may I present Mr. David MacHeath? He's our man, I think."

David MacHeath watched a blue line wriggle its way erratically across the face of an oscilloscope. "The wave form is way off," he said flatly, "and the frequency is slithering all over the place."

He squinted at the line for a moment then spoke to the man standing nearby. "Signal Harry to back her off two degrees, then run her up slowly, ten minutes at a time."

The other man flickered the key on the side of the small