the scientists ran experiments on the machine, and they made a
discovery of a kind they hadn't been looking for.

Somebody, they discovered, was picking the brains of the scientists
there.

Not the brains of the people working with the telepathy machine.

And not the brains of the people working on the several other Earth-
limited projects at Yucca Flats.

They'd been reading the minds of some of the scientists working on the
new and highly classified non-rocket space drive.

In other words, the Yucca Flats plant was infested with a telepathic
spy. And how do you go about finding a telepath? Malone sighed. Spies
that got information in any of the usual ways were tough enough to
locate. A telepathic spy was a lot tougher proposition.

Well, one thing about Andrew J. Burris. He had an answer for
everything. Malone thought of what his chief had said: "It takes a
thief to catch a thief. And if the Westinghouse machine won't locate a
telepathic spy, I know what will."

"What?" Malone had asked.

"It's simple," Burris had said. "Another telepath. There has to be one
around somewhere. Westinghouse did have one, after all, and the
Russians _still_ have one. Malone, that's your job: go out and find me
a telepath."

Burris had an answer for everything, all right, Malone thought. But he
couldn't see where the answer did him very much good. After all, if it
takes a telepath to catch a telepath, how do you catch the telepath
you're going to use to catch the first telepath?

Malone ran that through his mind again, and then gave it up. It
sounded as if it should have made sense, somehow, but it just didn't,
and that was all there was to that.

He dropped his cigarette to the ground and mashed it out with the toe
of his shoe. Then he looked up.

Out there, over the water, was the Jefferson Memorial. It stood, white
in the floodlights, beautiful and untouchable in the darkness. Malone
stared at it. What would Thomas Jefferson have done in a crisis like
this?

Jefferson, he told himself without much conviction, would have been
just as confused as he was.

But he'd have had to find a telepath, Malone thought. Malone
determined that he would do likewise, If Thomas Jefferson could do it,
the least he, Malone, could do was to give it a good try.

There was only one little problem:

_Where_, Malone thought, _do I start looking?_

2

Early the next morning, Malone awoke on a plane, h