It was strange to be thinking such thoughts. They must have been circulating somewhere in him, waiting for the right moment to break out.

His own father had not been a real father, not what a son wanted as a father. So, in some manner, Burton had taken Monat as one, perhaps because he could never accept another Earthman as one. Monat was from another world, therefore not, what was the word ... tainted? That was a curious word to leap to his mind.

In any event, Monat was forever out of reach of anybody in this world, Gone On. To what?

To conceal the tears, Burton strode to the furniture and began dragging it away from the door. By the time the others had joined him, his eyes were dry.

He opened the door and breathed deeply. The air was no fresher than that in the suite. But it offered liberation.

Near their apartments was a room containing a swimming pool sixty meters long and thirty meters wide. When no one was in the room it was dark, but the heat detectors would turn the light on if a single person entered it. The light was a simulated sun at zenith in a cloudless blue sky. The walls displayed a forest surrounding the pool and snow-capped mountains far in the distance. Even if a person stood within an inch of the wall, the trees seemed to be real. As real-looking as the trees, birds flew among the branches or lit on them, and their songs cried out pleasantly. Occasionally, the swimmers could see a rabbit or fox among the trees and, rarely, a panther-like beast or bear moving silently in the twilight under the branches.

The water was fresh and about 68 °F and had a depth of twelve meters at the deep end. Here the eight tenants usually gathered for an hour or so of swimming in midmorning.

Burton had been studying the list of operational limits until 11:00 a.m. He entered the huge echoing chamber noisy with cries and splashes and stood for a moment. All were there except Nur. The men were in scanty trunks and the women in bikinis. They did not seem to have a care nor had they posted a guard. Beamers, however, lay along the edge of the pool, and he saw several at the bottom outlined against the red, black and green mural.

Burton dived in and swam the length of the pool seven times. Then he hauled himself out and waited until de Marbot swam by. He called out to him; the Frenchman turned, came to the edge, and looked up. Burton considered his merry blue eyes, slick black hair, round face and snub nose.

Burton squatted down and said, "I'm going to make a flying trip, an exploratory one, through the tower. Do you want to come along?"

"That sounds like fun," de Marbot said. He narrowed his eyes and grinned. "Do you hope to surprise the Snark?"

"There's little chance of that," Burton said. "But... well... we might entice him to take some action. We'll be human decoys."

"I'm your man," the Frenchman said, and he pulled himself out. He was only five feet five inches tall and shared with Nur the distinction of being the smallest man in the group. Burton had chosen him as his companion, however, because he was utterly courageous and had more experience in martial action than any of them. Serving under Napoleon, he had been in most of the conqueror's great battles, had been wounded seventeen times, had fought in hundreds of small engagements, and had led so adventurous a life that A. Conan Doyle had written a series of stories based on his exploits. He was an excellent swordsman and a deadly shot and had an unsurpassed coolness under fire.

They dried themselves off in an anteroom, changed into dry clothes, sleeveless shirts and shorts, put their beamers in holsters, and walked along the pool. Burton paused for a minute to tell Turpin that they were going exploring.

"What time you coming back?" Turpin said through a mouthful of baked Montana grouse fed on huckleberries.

"About six p.m.," Burton said, glancing at his wristwatch.

"Maybe you should report in every hour on the hour."

"I don't think so," Burton said in a low voice, looking at the wall as if it had ears. Which it did. "I'm not going to make it easy for the unknown to find us."

Turpin smiled. "Yeah, that's right. Hope I see you again." He laughed, spewing out bits of meat and bread.

Burton was worried about Turpin. The man had lost much weight during the trying and dangerous passage over the mountains to the north polar sea. Now he seemed to be intent on becoming as fat as he had been on Earth, close to three hundred pounds. He was always eating, and he was not far behind Li Po in drinking.

Burton said, "We'll be flying around at random. I don't have the slightest idea where we'll be."

"Good luck," Turpin said.

Burton started to walk away but became aware that the Frenchman was not with him. Looking around, he saw him talking to Aphra. Evidently, he was explaining to her why he would be absent for a while. De Marbot was envied because he had a bedmate, but there were disadvantages to that. He had to account for his time to her, and, judging by their expressions and gestures, they were probably arguing over why she could not come along. Burton had no strong objections to taking her along at another time; she was tough and cool and skilled. Just now, he did not want more than one companion.

De Marbot, looking a little angry, returned to Burton.

"I have never heard that English expression, 'Take a flying fuck at a galloping goose,' " he said. Then, with that mercurial swiftness distinguishing him, he laughed, and he said, "How droll! How indeed could one do that?"

"It's a matter of synchronization," Burton said, grinning.

They left the pool and the door closed behind them. The noise was cut off; the corridor was huge and silent. It was easy to imagine someone—some thing—waiting around the corner for them, crouching, ready to spring.

Burton pointed out to de Marbot that he had filled the pockets on the sides of both chairs with power boxes for the beamers. They got into their chairs and caused them to raise into the air. Burton in front, de Marbot about twelve feet behind him, they sped toward the vertical shaft at the end of the hall. With a skill learned during the past three weeks, Burton curved the flight path so that he entered the shaft with only a slight decrease in speed, and he shot upwards.

He came out of the shaft at the next level at such velocity that his head was a few inches from the ceiling. He sent the chair down until his feet were twelve inches from the floor, and he hurtled along the muraled walls until he reached the end of the corridor. Then he stopped, pivoted the chair, and said, "You lead for a while."

The Frenchman led him through every passageway on that floor. The doors of every room were closed. For all Burton knew, their enemy was behind one. He did not believe this, however. Surely the Snark would have been notified by the Computer of the detection of heat from the two men. He would have told the Computer to warn him if the two were on an approach that would take them anywhere near him. He also might have activated the wall-screens, so that he could be watching them.

When they had passed through every corridor, de Marbot stopped his chair by a shaft. "This is fun," he said, "the wind on your face, your hair blowing, the scenery, such as it is, whistling by. It is not as good as riding a horse, but it will do. And, certainly, no horse would jump off into the shaft."

Burton took the lead now and rose up the shaft until he came to the top level. Down the corridor would be the entrance to the hangar, visited several days before. They entered the very wide entrance into the vast area with its brooding craft. Burton counted them and found that there were the same number as before. The unknown was still in the tower. That is, unless he had a ship secreted somewhere else. There was always an unless.