It took ten minutes of scrambling over the treacherous surface to reach Greg. Tom saw his brother tugging at a huge chunk of granite that was wedged into a crevice in the rock. Tom got there just as the Major and Johnny topped a rise on the other side and hurried down to them.

The rock gave way, rolling aside, and Greg reached down into the crevice. Tom leaned over to help him. Between them they lifted out the thing that had been wedged down beneath the boulder.

It was a metal cylinder, four feet long, two feet wide, and bluntly tapered at either end. In the sunlight it gleamed like polished silver, but they could see a hairline break in the metal encircling the center portion.

They had found Roger Hunter's bonanza.

In the cabin of the scout-ship they broke the cylinder open into two perfect halves. It came apart easily, a sh.e.l.l of paper-thin but remarkably strong metal, protecting the tightly packed contents.

There was no question what the cylinder was, even though there was nothing inside that looked even slightly familiar at first examination.

There were several hundred very tiny thin discs of metal that fit on the spindle of a small instrument that was packed with them. There were spools of film, thin as tissue but amazingly strong. Examined against the light in the cabin, the film seemed to carry no image at all ... but there was another small machine that accepted the loose end of the film, and a series of lenses that glowed brightly with no apparent source of power. There was a thick block of shiny metal covered on one side with almost invisible scratches....

A time capsule, beyond doubt. A confusing treasure, at first glance, but the idea was perfectly clear. A hard sh.e.l.l of metal protecting the records collected inside....

_Against what? A planetary explosion? Some sort of cosmic disaster that had blown a planet and its people into the fragments that now filled the Asteroid Belt?_

At the bottom of the cylinder was a small tube of metal. They examined it carefully, trying to guess what it was supposed to be. At the bottom was a tiny stud. When they pressed it, the cylinder began to expand and unfold, layer upon layer of thin glistening metallic material that spread out into a sheet that stretched halfway across the cabin.

They stared down at it. The metal seemed to have a life of its own, glowing and glinting, focussing light into pinpoints on its surface.

It was a map.

At one side, a glowing ball with a fiery corona, an unmistakeable symbol that any intelligent creature in the universe that was able to perceive it at all would recognize as a star. Around it, in clearly marked orbits, ten planets. The third planet had a single satellite, the fourth two tiny ones. The sixth eleven. The seventh planet had ten, and was encircled by glowing rings.

But the fifth planet was broken into four parts.

Beyond the tenth planet there was nothing across a vast expanse of the map ... but at the far side was another star symbol, this one a double star with four planetary bodies.

They stared at the glowing map, speechless. There could be no mistaking the meaning of the thing that lay before them, marked in symbols that could mean only one thing to any intelligence that could recognize stars and planets.

But in the center of the sheet was another symbol. It lay halfway between the two Solar Systems, in the depths of interstellar s.p.a.ce. It was a tiny picture, a silvery sliver of light, but it too was unmistakeable.

It could be nothing else but a Starship.

Later, as they talked, they saw that the map had told each of them, individually, the same thing. "They had a star-drive," Tom said.

"Whatever kind of creatures they were, and whatever the disaster that threatened their planet, they had a star-drive to take them out of the Solar System to another star."

"But why leave a record?" Greg wanted to know. "If n.o.body was here to use it...."

"Maybe for the same reason that Earthmen bury time capsules with records of their civilization," Major Briarton said. "I'd guess that the records here will tell, when they have been studied and deciphered. Perhaps there was already some sign of intelligent life developing elsewhere in the Solar System. Perhaps they hoped that some of their own people would survive. But they had a star-drive, so some of them must have escaped.

And with the record here...."

"We may be able to follow them," Greg said.

"If we can decipher the record," Johnny Coombs said. "But we don't have any clue to their language."

"Did you have any trouble understanding what the map had to say?" the Major said quietly.

"No...."

"I don't think the rest will be much more difficult. They were intelligent creatures. The record will be understandable, all right." He started to fold the map back into a tube again. "Maybe Roger Hunter tried to use the film projector. We'll never know. But he must have realized that he had discovered the secret of a star-drive. He realized that the United Nations were the ones to explore it and use it, and he gave his life to keep it out of the hands of Tawney and his men...."

"A pity," a cold voice said close behind them, "that he didn't succeed, after all."

They whirled. In the hatchway to the after-cabin, Merrill Tawney was standing, with a smile on his lips and a Markheim stunner trained directly on Major Briarton's chest.

15. The Final Move

"I realize I'm much earlier than you expected, Major. You did a very neat job of camouflaging your takeoff ... we were almost fooled ... and no doubt the dummy ship you sent off later got full fanfare. I suppose there will be a dozen Patrol ships converging on this spot in a few hours, expecting to surprise a Jupiter Equilateral ship making a desperate attempt to hijack your little treasure here."

The little fat man laughed cheerfully. "Unfortunately for you," he added, "we have many friends on Mars ... including a man in the Map room ... and I'm afraid your little trap isn't going to work after all."

The Major's face was gray. "How did you get here?"

"By hitch-hiking. How else? Most uncomfortable, back there, even with a pile of pressure suits for padding, but your pilot was really very skillful."

Johnny Coombs turned on the Major. "What does he mean, a trap? I don't get this...."

The Major sighed wearily. "I had to try to force his hand. Even if we found what we were looking for, we had no case that could stand up against them. We needed _proof_ ... and I thought that with this as bait we could trap them. He's right about the Patrol ships ... but they won't be near for hours."

"And that will be a little late to help," Tawney said pleasantly.

The Major glared at him. "Maybe so ... but you've gone too far this time. This is an official U.N. ship. You'll never be able to go back to Mars."

"Really?" the fat man said. "And why not? Officially I'm on Mars right now, with plenty of people to swear to the fact." He chuckled. "You seem to forget that little matter of proof, Major. When your Patrol ships find a gutted ship and five corpses, they may suspect that something more than an accident was involved, but what can they prove? Nothing more than they could prove in the case of Roger Hunter's accident.

Scout-ships have been known to explode before."

He ran his hand over the metal cylinder. "And as for this ... it's really a surprise. Of course when we failed to find any evidence of mining activity, we were certain that Roger Hunter's bonanza was something more than a vein of ore, but _this_! You can be certain that we will exploit the secret of a star-drive to the very fullest."

"How do you think you can get away with it?" the Major said. "Turning up with something like that right after a whole series of suspicious accidents in s.p.a.ce?"

"Oh, we aren't as impatient as some people. We wouldn't be so foolish as to break the news now. Five years from now, maybe ten years, one of our orbit-ships will happen upon a silvery capsule on one of our asteroid claims, that's all. I wouldn't be surprised if a non-company observer might be on board at the time, maybe even a visiting Senator from Earth.

For something this big, we can afford to be patient."

There was silence in the little scout-ship cabin. The end seemed inevitable. This was a desperate move on Tawney's part. He was gambling everything on it; he would not take the chance of letting any of them return to Mars or anywhere else to testify.

Greg caught Tom's eye, saw the hopelessness on his brother's face. He clenched his fists angrily at his side. If it were not for Tom, Dad's bonanza might have gone on circling the sun for centuries, maybe forever, wedged in its hiding place on the rocky surface of the eccentric asteroid.

But it had been found. Earth needed a star-drive badly; a few more years, and the need would be desperate. And if a group of power-hungry men could control a star-drive and hold it for profit, they could blackmail an entire planet for centuries, and build an empire in s.p.a.ce that could never be broken.