Gary watched her closely, marveling at the complete self-assurance in her face, at the clipped confidence of her words. Vaguely, he sensed something else, too. That she was leader here. That in the last few minutes she had clutched in her tiny hands the leadership of this band of men on Pluto.

That not all their brains combined could equal hers. That she held mastery over things they had not even thought about. She had thought, she said, for almost a thousand years.

How long did the ordinary man have to devote to thought? A normal lifetime of useful, skilled, well-directed adult effort did not extend much beyond fifty years. One third of that was wasted in sleep, one sixth spent in eating and in relaxation, leaving only a mere twenty-five years to think, to figure out things. And then one died and all one's thoughts were lost.

Embryonic thoughts that might, in just a few more years, have sprouted into well-rounded theory. Lost and left for someone else to discover if he could… and probably lost forever.

But Caroline Martin had thought for forty lifetimes, thought with the sharp, quick brain of youth, without interruption or disturbance. No time out for eating or for sleeping. She might have spent a year, or a hundred years, on one problem, had she wished.

He shivered as he thought of it. No one could even vaguely imagine what she knew, what keys she had found out there in the dark of interplanetary space. And — she had started with the knowledge of that secret of immense power she had refused to reveal even when it meant eternal exile for her.

She was talking again, her words crisp and clipped, totally unlike the delightful companion that she could be.

"You see, I am interested in time and space, always have been. The weapon that I discovered and refused to turn over to the military board during the Jovian war was your geosector… but with a vast difference in one respect.”

"You discovered the geosector, the principle of driving a ship by space warp, a thousand years ago?" asked Kingsley.

She nodded. "Except that they wouldn't have used it for driving ships…