"However," Dr. O"Connor said, breaking what was left of Malone"s train of thought, "young Charlie died soon thereafter, and we decided to go on checking the machine. It was during this period that we found someone else reading the minds of our test subjects--sometimes for a few seconds, sometimes for several minutes."

"Aha," Malone said. Things were beginning to make sense again. _Someone else._ That, of course, was the spy.

"I found," Dr. O"Connor said, "on interrogating the subjects more closely, that they were, in effect, thinking on two levels. They were reading the book mechanically, noting the words and sense, but simply shuttling the material directly into their memories without actually thinking about it. The actual thinking portions of their minds were concentrating on aspects of Project Isle."

"In other words," Malone said, "someone was spying on them for information about Project Isle?"

"Precisely," Dr. O"Connor said with a frosty, teacher-to-student smile.

"And whoever it was had a much higher concentration time than Charlie had ever attained. He seems to be able to retain contact as long as he can find useful information flowing in the mind being read."

"Wait a minute," Malone said. "Wait a minute. If this spy is so clever, how come he didn"t read _your_ mind?"

"It is very likely that he has," O"Connor said. "What does that have to do with it?"

"Well," Malone said, "if he knows you and your group are working on telepathy and can detect what he"s doing, why didn"t he just hold off on the minds of those geniuses when they were being tested in your machine?"

Dr. O"Connor frowned. "I"m afraid that I can"t be sure," he said, and it was clear from his tone that, if Dr. Thomas O"Connor wasn"t sure, no one in the entire world was, had been, or ever would be. "I do have a theory, however," he said, brightening up a trifle.

Malone waited patiently.

"He must know our limitations," Dr. O"Connor said at last. "He must be perfectly well aware that there"s not a single thing we can _do_ about him. He must know that we can neither find nor stop him. Why should he worry? He can afford to ignore us--or even bait us. We"re helpless, and he knows it."

That, Malone thought, was about the most cheerless thought he had heard in some time.

"You mentioned that you had an insulated room," the FBI agent said after a while. "Couldn"t you let your men think in there?"

Dr. O"Connor sighed. "The room is shielded against magnetic fields and electromagnetic radiation. It is perfectly transparent to psionic phenomena, just as it is to gravitational fields."

"Oh," Malone said. He realized rapidly that his question had been a little silly to begin with, since the insulated room had been the place where all the tests had been conducted in the first place. "I don"t want to take up too much of your time, doctor," he said after a pause, "but there are a couple of other questions."

"Go right ahead," Dr. O"Connor said. "I"m sure I"ll be able to help you."

Malone thought of mentioning how little help the doctor had been to date, but decided against it. Why antagonize a perfectly good scientist without any reason? Instead, he selected his first question, and asked it. "Have you got any idea how we might lay our hands on another telepath? Preferably one that"s not an imbecile, of course."

Dr. O Connor"s expression changed from patient wisdom to irritation. "I wish we could, Mr. Malone. I wish we could. We certainly need one here to help us with our work--and I"m sure that _your_ work is important, too. But I"m afraid we have no ideas at all about finding another telepath. Finding little Charlie was purely fortuitous--purely, Mr.

Malone, fortuitous."

"Ah," Malone said. "Sure. Of course." He thought rapidly and discovered that he couldn"t come up with one more question. As a matter of fact, he"d asked a couple of questions already, and he could barely remember the answers. "Well," he said, "I guess that"s about it, then, doctor. If you come across anything else, be sure and let me know."

He leaned across the desk, extending a hand. "And thanks for your time,"

he added.

Dr. O"Connor stood up and shook his hand. "No trouble, I a.s.sure you," he said. "And I"ll certainly give you all the information I can."

Malone turned and walked out. Surprisingly, he discovered that his feet and legs still worked. He had thought they"d turned to stone in the office long before.

It was on the plane back to Washington that Malone got his first inkling of an idea.

The only telepath that the Westinghouse boys had been able to turn up was Charles O"Neill, the youthful imbecile.

All right, then. Suppose there were another one like him. Imbeciles weren"t very difficult to locate. Most of them would be in inst.i.tutions, and the others would certainly be on record. It might be possible to find someone, anyway, who could be handled and used as a tool to find a telepathic spy.

And--happy thought!--maybe one of them would turn out to be a high-grade imbecile, or even a moron.

[Ill.u.s.tration]

Even if they only turned up another imbecile, he thought wearily, at least Dr. O"Connor would have something to work with.

He reported back to Burris when he arrived in Washington, told him about the interview with Dr. O"Connor, and explained what had come to seem a rather feeble brainstorm.

"It doesn"t seem too productive," Burris said, with a shade of disappointment in his voice, "but we"ll try it."

At that, it was a better verdict than Malone had hoped for. He had nothing to do but wait, while orders went out to field agents all over the United States, and quietly, but efficiently, the FBI went to work.

Agents probed and pried and poked their noses into the files and data sheets of every mental inst.i.tution in the fifty states--as far, at any rate, as they were able.

It was not an easy job. The inalienable right of a physician to refuse to disclose confidences respecting a patient applied even to idiots, imbeciles, and morons. Not even the FBI could open the private files of a licensed and registered psychiatrist.

But the field agents did the best they could and, considering the circ.u.mstances, their best was pretty good.

Malone, meanwhile, put in two weeks sitting glumly at his Washington desk and checking reports as they arrived. They were uniformly depressing. The United States of America contained more subnormal minds than Malone cared to think about. There seemed to be enough of them to explain the results of any election you were unhappy over.

Unfortunately, subnormal was all you could call them. Not one of them appeared to possess any abnormal psionic abilities whatever.

There were a couple who were reputed to be poltergeists--but in neither case was there a single shred of evidence to substantiate the claim.

At the end of the second week, Malone was just about convinced that his idea had been a total washout. A full fortnight had been spent on digging up imbeciles, while the spy at Yucca Flats had been going right on his merry way, scooping information out of the men at Project Isle as though he were scooping beans out of a pot. And, very likely, laughing himself silly at the feeble efforts of the FBI.

Who could he be?

_Anyone_, Malone told himself unhappily. _Anyone at all._ He could be the janitor that swept out the buildings, one of the guards at the gate, one of the minor technicians on another project, or even some old prospector wandering around the desert with a scintillation counter.

Is there any limit to telepathic range?

The spy could even be sitting quietly in an armchair in the Kremlin, probing through several thousand miles of solid earth to peep into the brains of the men on Project Isle.

That was, to say the very least, a depressing idea.

Malone found he had to a.s.sume that the spy was in the United States--that, in other words, there was some effective range to telepathic communication. Otherwise, there was no point in bothering to continue the search.

Therefore, he found one other thing to do. He alerted every agent to the job of discovering how the spy was getting his information out of the country.

He doubted that it would turn up anything, but it was a chance. And Malone hoped desperately for it, because he was beginning to be sure that the field agents were never going to turn up any telepathic imbeciles.

He was right.