"What did you do to the rockets?" demanded Docchi.

"Nothing! There wasn't a thing I _could_ do. We were already running at top speed."

"We're above it. Way above it. How?"

There was nothing to explain their astonishing velocity. Cameron, Anti, and Jordan were in the control compartment. Nona still sat huddled up, hands pressed tight against her head. There was no explanation at all, yet power was pouring into the gravital unit, as a long unused, actually useless dial was indicating.

"The gravital drive is working," Docchi blankly pointed out.

"Nonsense," said Anti. "I don't feel any weight."

"You don't," answered Docchi. "You won't. The gravital unit was originally installed to drive the ship. When that proved unsatisfactory, it was converted. The difference is slight but important. An undirected general field produces weight effects inside the ship. That's for pa.s.senger comfort. A directed field, outside the ship, will drive it. You can have one or the other, not both."

"But I didn't turn on the gravital drive," said Jordan in flat bewilderment. "I couldn't if I wanted to. It's disconnected."

"I would agree with you, except for one thing. It's working." Docchi stared at Nona, whose eyes were closed. "Get her attention," he said.

It was Jordan who gently touched her shoulder. She opened her eyes. On the instrument board, the needle of a once useless dial rose and fell.

"What's the matter with the poor dear?" asked Anti. "She's shaking."

"Let her alone," said Docchi.

No one moved. No one said anything at all. Minutes pa.s.sed while the ancient ship creaked and groaned and ran away from the fastest rockets in the Solar System.

"I think I know," said Docchi at last, still frowning. "Consider the gravity-generating plant. Part of it is an electronic computer, capable of making the necessary calculations and juggling the proportion of power required to produce, continuously, directed or undirected gravity. In other words, a brain, a complex mechanical intelligence. From the viewpoint of that intelligence, why should it perform _ad infinitum_ a complicated but meaningless routine? It didn't know why, and because it didn't, very simply, it refused to do so.

"Now consider Nona. She's deaf, can't speak, can't communicate. In a way she's comparable to the gravital computer. Like it, she has a very high potential intelligence. Like it, she's had difficulty grasping the facts of her environment. Unlike it, though, she has learned something. How much, I don't know, but it's far more than the Medicouncil psychologists credit her with."

"Yeah," said Jordan dubiously. "But what's happening now?"

"If there were two humans involved, you would call it telepathy,"

answered Docchi hesitantly, fumbling for concepts he could only sense without grasping. "One intelligence is electronic, the other organic.

You'll have to coin a new term, because the only one I know is extrasensory perception, and that's obviously ridiculous. It is, isn't it?"

Jordan smiled and flexed his arms. Under the shapeless garment his muscles rippled. "It isn't," he said. "The power was there, but we're the only ones who know how to use it. Or rather Nona is."

"Power?" repeated Anti, rising majestically. "You can keep it. I want just enough to get to Centauri."

"I think you'll get it," Docchi promised. "A lot of things seem clearer now. For example, in the past, why didn't gravital units work well at considerable distances from the Sun? As a matter of fact, the efficiency of each unit was inversely proportional to the square of the distance between it and the Sun.

"The gravital computer is a deaf, blind, ma.s.s-sensitive brain. The major fact in its existence is the Sun, the greatest ma.s.s in the Solar System. To such a brain, leaving the Solar System would be like stepping off the edge of a flat world, because it couldn't be aware of stars.

"Now that it knows about the Galaxy, the drive will work anywhere.

With Nona to direct it, even Sirius isn't far away."

"Doc," said Jordan carelessly, "you'd better be figuring a way to get off the ship. Remember, we're going faster than man ever went before."

He chuckled. "Unless, of course, you _like_ our company and don't want to leave."

"We've got to do some figuring ourselves," interposed Docchi. "Such as where we are heading now."

"A good idea," said Jordan. He busied himself with charts and calculations. Gradually his flying fingers slowed. His head bent low over his work. At last he stopped and folded his arms.

"Where?" asked Docchi.

"There." Jordan dully punched the telecom selector and a view became fixed on the screen. In the center glimmered a tiny world, a fragment of a long-exploded planet. Their destination was easily recognizable.

It was Handicap Haven.

"But why do we want to go there?" asked Anti. She looked in amazement at Docchi.

"We're not going voluntarily," he answered, his voice flat and spent.

"We're going where the Medicouncil wants us to go. We forgot about the monitor system. When Nona activated the gravital unit, that fact was indicated at some central station. All the Medicouncil had to do was use the monitor to take the gravital drive away from Nona."

"We thought we were running away from the ships, which we were, but only to beat them back to the junkpile?" asked Anti.

Docchi nodded.

"Well, it's over. We did our best. There's no use crying about it."

Yet she was. She pa.s.sed by Nona, patting her gently. "It's all right, darling. You tried."

Jordan followed her from the compartment.

Cameron remained; he came over to Docchi. "Everything isn't lost," he said, somewhat awkwardly. "You're back where you started from, but Nona at least will benefit."

"Benefit?" said Docchi. "Someone will. It won't be Nona."

"You're wrong. Now that she is an important factor--"

"So is a special experimental machine. Very valuable. I don't think she'll like that cla.s.sification."

Silence met silence. It was Dr. Cameron who turned away.

"That ghastly glow of yours when you're angry always did upset me.

I'll come back when it's dimmer."

Docchi glared after him. Cameron was the only normal aware that it was Nona who controlled the gravital unit. All the outside world could realize was that it was in operation, as it had been designed to work, but never had. If Cameron could be disposed of--

He shook his head. It wouldn't solve anything. He might fool them for a while. They might think he was responsible. In the end, they'd find out. Nona wasn't capable of that much deception, for she never knew what a test was.

He went over to her. Once he had hoped.... It didn't matter what he had hoped.

She looked up and smiled. She had a right to. No word had ever broken the silence of her mind, but now she was communicating with something, whatever it was that an electronic brain could say. Of course she didn't understand that the conversation was taking place between two captives, herself and the gravital computer.

Abruptly he turned away. He stopped at the telecom panel and methodically kicked it apart. Delicate tubes smashed into powder. The emergency radio he thoroughly demolished.

The ship was firmly in the grip of the gravital monitor. There was nothing he could do about that. All that remained was to protect Nona from their prying minds as long as he could.

She didn't hear the noise, or didn't care. She sat there, head in her hands, calm and smiling.