He stopped. He seemed uncertain.

Lesbee said angrily, 'Who are you trying to fool? We're a dozen light-years in actual distance from Earth. You mean years, not months.'

Browne hesitated. 'All right, a few years. But at least not a lifetime. So if you'll promise not to scheme against me further, I'll promise-'

'You'll promise!' Lesbee spoke savagely. He had been taken aback by Browne's instant attempt to blackmail. But the momentary sense of defeat was gone. He knew with stubborn rage that he would stand for no nonsense.

He said in an uncompromising tone, 'Mr. Browne, twenty seconds after I stop speaking, you start talking. I mean it.'

Browne said, 'Are you going to kill me? That's the only thing I want reassurance on. Look' – his voice appealed – 'we don't have to fight any more. We can go home. Don't you see? The long madness is just about over. Nobody has to die. But quick, man, destroy that creature with your remote-control method!'

Lesbee hesitated. What the other was saying was at least partly true. His words so far included an attempt to make twelve years sound like twelve weeks or, at most, twelve months. But the fact was, it was a short period compared to the century-long journey which, at one time, had been the only possibility.

He thought, 'Am I going to kill him?'

It was hard to believe that he would, under the circumstances. But if not death, what then? He sat there, uncertain. The vital seconds went by, and he could see no solution. He thought finally, in desperation: 'I'll have to give in for the moment.'

'I'll promise you this,' he said. 'If you can figure out how I can feel safe in a ship commanded by you, I'll give your plan consideration. And now, mister, start talking.'

Browne nodded. 'I accept that promise.'

Browne went on, 'There are two possible explanations, and naturally I prefer the more commonplace one. That is, I postulate that this robot used some kind of energy flows, like a balance of tractor and pressor beams. He used this in the same instantaneous, or rapid, feedback system that you and I use in our muscles to balance ourselves when we walk under normal gravity.'

'What is the second explanation?' Lesbee asked.

'That takes us beyond normal response and normal energy situations. When we last saw the robot, the appearance he presented was of an object for which the entire phenomenon of inertia had been suspended. If this were true, then we are observing a big event, indeed. To understand it, we'd have to consider light-speed theories and, particularly, the Lorentz-Fitzgerald Contraction Theory. At the speed of light, mass becomes infinite but size is zero. Thus, matter ceases instantly to be subject to inertia as we know it. There is no other condition in the universe where that can happen naturally. Dzing has somehow created the condition artificially – if this second explanation is the true one.'

Lesbee said doubtfully, 'I'm inclined to accept the tractor-pressor explanation. Is there any way we could determine which method he used?'

Browne could think of no method for determining it after the event. 'If it was a combination of energy flows, then it probably registered on the board at the time. And it will show again when he comes into the room.'

That, Lesbee realized, would be a little late to be useful. He asked helplessly, 'Is there anything we need to learn from this creature?'

'We've already learned it,' said Browne. 'This thing has a casual control of energy and an understanding of space time that is far ahead of us scientifically. Therefore, we have no business in this sun system. So let's get out of here as fast as we can.'

Lesbee was remembering how all the Karn on the lifeboat had pretended to be affected by inertia, when they evidently had not been.

Aloud, he said, 'Maybe your second explanation does cover it better.'

Browne shook his head. 'No, he'd have been here within instants, if that was what he could do. There's a state of compressed time at light-speed.'

'How do you mean?'

Browne was uneasy. 'Let's not waste time on an intellectual discussion,' he said.

'I want to know what you mean.'

'It's condensed time. He would have a time ratio, in relation to us, of hundreds to one. Ten minutes for us could be only a second for him.'

'Then he should have been here by now, if that's what he could do?'

'That's what I've been trying to tell you.'

Lesbee had to fight to hold back his excitement. The thought in his mind was that by pressing Button Three immediately after Button One, he had prevented that kind of instantaneous return by the Karn.

He thought, 'And I did it without even knowing how deadly dangerous the situation was, because I was logical, because I didn't want to take any chances.'

He felt a great joy in himself.

'For God's sake, Lesbee-'

Lesbee's elation faded as rapidly as it had come, for Browne was as great a danger as ever.

Lesbee gazed at the man gloomily.

'For God's sake, Lesbee,' said Browne, 'that thing must be practically back here. Tell me what you want me to agree to, and I'll do it.'

Lesbee said, 'I think we ought to have an election.'

'I agree,' said Browne instantly. 'You set it up.' He broke off. 'And now release me from these tractors, and let's act.'

Lesbee gazed at the man's face, saw there the same openness of countenance, the same frank, honest look that had preceded the execution order, and he thought, 'What can he do?'

He considered many possibilities, and thought finally, desperately, 'He's got the advantage of superior knowledge – the most undefeatable weapon in the world. The only thing I can really hope to use against it in the final issue is my knowledge of a multitude of technician-level details.'

But – what could Browne do against him?

Lesbee said unhappily, 'Before I free you, I want to lift you over to Mindel. When I do, you get his blaster for me.'

'Sure,' said Browne casually.

A few minutes later he handed Mindel's gun over to Lesbee. So that wasn't it.

Lesbee thought: 'There's Miller on the bridge – can it be that Miller flashed him a ready signal when my back was turned to the board?'

Perhaps, like Browne, Miller had been temporarily incapacitated during the period of acceleration. It was vital that he find out Miller's present capability.

Lesbee tripped the intercom between the two boards. The rugged, lined face of the first officer showed large on the screen. Lesbee could see the outlines of the bridge behind the man and, beyond, the starry blackness of space. Lesbee said courteously, 'Mr. Miller, how did you make out during the acceleration?'

'It caught me by surprise, Captain. I really got a battering. I think I was out for a while. But I'm all right now.'

'Good,' said Lesbee. 'As you probably heard, Captain Browne and I have come to an agreement, and we are now going to destroy the creature that is loose on the ship. Stand by!'

Cynically, he broke the connection.

Miller was there all right, waiting. But the question was still, what could Miller do? The answer was, of course, that Miller could pre-empt. And – Lesbee asked himself – what could that do?

Suddenly, he had the answer.

He now understood Browne's plan. They were waiting for Lesbee to let his guard down for a moment. Then Miller would take over, cut off the tractor beam from Browne, and seize Lesbee with it.

For the two officers it was vital that Lesbee not have the time to fire the blaster at Browne. Lesbee thought: 'It's the only thing they can be worried about, so far as I'm concerned.' And as soon as Lesbee was dead, or under control, Browne would grab the mechanism out of his pocket, and activate Stage Three – which would destroy Dzing.

Their plan, as Lesbee saw it, had only one flaw. Now that he had deduced what it was, he could turn it against them.