“We can’t kick him out just like that, either, or the Russians will start wondering.”

“Do you have any suggestions?”

They were walking down the long corridor toward the distant elevator in the emptiness of four in the morning.

Dr. Kristow said, “I’ve looked into his work. He’s a good man, better than most, and not happy in his job, either. He hasn’t the temperament for teamwork.”

“So?”

“But he is the type for an academic job. If we can arrange to have a large university offer him a chair in physics, I think he would take it gladly. There would be enough nonsensitive areas to keep him occupied; we would be able to keep him in close view; and it would be a natural development. The Russians might not start scratching their heads. What do you think?”

Brand nodded. “It’s an idea. Even sounds good. I’ll put it up to the chief.”

They stepped into the elevator and Brand allowed himself to wonder about it all. What an ending to what had started with one letter of a name.

Marshall Sebatinsky could hardly talk. He said to his wife, “I swear I don’t see how this happened. I wouldn’t have thought they knew me from a meson detector.

—Good Lord, Sophie, Associate Professor of Physics at Princeton. Think of it.”

Sophie said, “Do you suppose it was your talk at the A.P.S. meetings?”

“I don’t see how. It was a thoroughly uninspired paper once everyone in the division was done hacking at it.” He snapped his fingers. “It must have been Princeton that was investigating me. That’s it. You know all those forms I’ve been filling out in the last six months; those interviews they wouldn’t explain. Honestly, I was beginning to think I was under suspicion as a subversive.—It was Princeton investigating me. They’re thorough.”

“Maybe it was your name,” said Sophie. “I mean the change.”

“Watch me now. My professional life will be my own finally. I’ll make my mark. Once I have a chance to do my work without—” He stopped and turned to look at his wife. “My name! You mean the S.”

“You didn’t get the offer till after you changed your name, did you?”

“Not till long after. No, that part’s just coincidence. I’ve told you before Sophie, it was just a case of throwing out fifty dollars to please you. Lord, what a fool I’ve felt all these months insisting on that stupid S.”

Sophie was instantly on the defensive. “I didn’t make you do it, Marshall. I suggested it but I didn’t nag you about it. Don’t say I did. Besides, it did turn out well. I’m sure it was the name that did this.”

Sebatinsky smiled indulgently. “Now that’s superstition.”

“I don’t care what you call it, but you’re not changing your name back.”

“Well, no, I suppose not. I’ve had so much trouble getting them to spell my name with an S, that the thought of making everyone move back is more than I want to face. Maybe I ought to change my name to Jones, eh?” He laughed almost hysterically.

But Sophie didn’t. “You leave it alone.”

“Oh, all right, I’m just joking.—Tell you what. I’ll step down to that old fellow’s place one of these days and tell him everything worked out and slip him another tenner. Will that satisfy you?”

He was exuberant enough to do so the next week. He assumed no disguise this time. He wore his glasses and his ordinary suit and was minus a hat.

He was even humming as he approached the store front and stepped to one side to allow a weary, sour-faced woman to maneuver her twin baby carriage past.

He put his hand on the door handle and his thumb on the iron latch. The latch didn’t give to his thumb’s downward pressure. The door was locked.

The dusty, dim card with “Numerologist” on it was gone, now that he looked. Another sign, printed and beginning to yellow and curl with the sunlight, said “To let.”

Sebatinsky shrugged. That was that. He had tried to do the right thing.

Haround, happily divested of corporeal excrescence, capered happily and his energy vortices glowed a dim purple over cubic hypermiles. He said, “Have I won? Have I won?”

Mestack was withdrawn, his vortices almost a sphere of light in hyperspace. “I haven’t calculated it yet.”

“Well, go ahead. You won’t change the results any by taking a long time.—Wowf, it’s a relief to get back into clean energy. It took me a microcycle of time as a corporeal body; a nearly used-up one, too. But it was worth it to show you.”

Mestack said, “All right, I admit you stopped a nuclear war on the planet.”

“Is that or is that not a Class A effect?”

“It is a Class A effect. Of course it is.”

“All right. Now check and see if I didn’t get that Class A effect with a Class F stimulus. I changed one letter of one name.”

“What?”

“Oh, never mind. It’s all there. I’ve worked it out for you.”

Mestack said reluctantly, “I yield. A Class F stimulus.”

“Then I win. Admit it.”

“Neither one of us will win when the Watchman gets a look at this.”

Haround, who had been an elderly numerologist on Earth and was still somewhat unsettled with relief at no longer being one, said, “You weren’t worried about that when you made the bet.”

“I didn’t think you’d be fool enough to go through with it.”

“Heat-waste! Besides, why worry? The Watchman will never detect a Class F stimulus.”

“Maybe not, but he’ll detect a Class A effect. Those corporeals will still be around after a dozen microcycles. The Watchman will notice that.”

“The trouble with you, Mestack, is that you don’t want to pay off. You’re stalling.”

“I’ll pay. But just wait till the Watchman finds out we’ve been working on an unassigned problem and made an unallowed-for change. Of course, if we—” He paused.

Haround said, “All right, we’ll change it back. He’ll never know.”

There was a crafty glow to Mestack’s brightening energy pattern. “You’ll need another Class F stimulus if you expect him not to notice.”

Haround hesitated. “I can do it.”

“I doubt it.”

“I could.”

“Would you be willing to bet on that, too?” Jubilation was creeping into Mestack’s radiations.

“Sure,” said the goaded Haround. “I’ll put those corporeals right back where they were and the Watchman will never know the difference.”

Mestack followed through his advantage. “Suspend the first bet, then. Triple the stakes on the second.”

The mounting eagerness of the gamble caught at Haround, too. “All right, I’m game. Triple the stakes.”

“Done, then!”

“Done.”