stump of masonry bearing mute testimony to its once sky-soaring height.
'Isn't there anyone who can help us?' asked Kingsley. 'Surely there is someone to whom we might appeal.”
'There is no one,' said the Engineer. 'We are alone. For thousands of light years there are no other great races to be found. For millions of years the Hellhounds and the Engineers have fought, and it has always been those two and just those two alone. Thus it is now. Before, we have driven them off.
Many times have we destroyed them almost to the point of annihilation that we might hold their cosmic ambitions under proper check. Now it seems they will be the victors.”
'No other race,' said Gary, musing, 'for thousands of light years.”
He stared moodily at the screen, saw a piece of twisted wreckage that had at one time been a ship crash into the stump of broken tower and hang there, like a bloody, smoke-blackened offering tossed on the altar of war.
'But there is,' he said. 'There is at least one great race very near to us.”
'There is?' asked Caroline. 'Where?”
'On the other universe,' said Gary. 'A race that is fully as great, as capable as the Engineers. A race that should be glad to help us in this fight.”
'Great suffering snakes,' yelped Herb, 'why didn't we think of that before?”
'I do not understand,' said the Engineer. 'I agree they are a great race and very close to us. Much too close, in fact. But they might as well be a billion light years away. They can do us no good. How would you get them here?”
'Yes,' rumbled Kingsley, 'how would you get them here?”
Gary turned to the Engineer. 'You have talked to them,' he said. 'Have you any idea of what kind of people they might be?”
'A great people,' said the Engineer. 'Greater than we in certain sciences.
They are the ones who notified us of the danger of the approaching universes. They knew they were nearing our universe when we didn't even know there was another universe other than our own. Such very clever people.”
'Talk to them again,' said Gary. 'Give them the information that will enable them to make a miniature universe… one of Caroline's hyperspheres.”
'But,' said the Engineer, 'that would do no good.”
'It would,' said Gary, grimly, 'if they could use the laws of space to form a blister on the surface of their universe. If they could go out to the very edge of their space-time frame and create a little bubble of space — a bubble that would pinch off, independent of the parent universe and exist independently in the five-dimension inter- space.”
Gary heard the rasp of Kingsley's breath in his helmet phones.
'They could cross to our universe,' rumbled the scientist. 'They could navigate through the inter-space with complete immunity.”
Gary nodded inside his helmet. 'Exactly,' he said.
'Why, Gary,' whispered Caroline, 'what a thought!”
'Boy,' said Herb, 'I can hardly wait to see them Hellhounds when we sic those fellows on them.”
'Maybe,' said Tommy, 'they won't come.”
'I will talk to them,' said the Engineer.
He left the room and they followed him through a mighty corridor to another room filled with elaborate machinery.
The Engineer strode to a control panel and worked with dials and studs.
Intense blue power surged through long tubes and flashed in dizzy whirls through coils of glass.
Tubes boomed into sudden brilliance and the deep hum of power surged into the room.
They could hear the probing fingers of the Engineer's thoughts, thrusting out, calling to those other people in another universe. The power of thought being hurled through the very warp and weave of twisted time and space.
Then came another probing thought, a string of thoughts that were impossible to understand, hazed and blurred and all distorted. But apparently perfectly clear to the Engineer, who stood motionless under the inverted cone of glass that shimmered with blue fire of power.
Two entities talking to one another and the queer, challenging unknown of five-dimensional inter-space separating them!
The power ebbed and the blue fire sank to a glimmer in the tubes.
The Engineer turned around and faced the Earthlings.
'They will come,' he said, 'but only on one condition.”
Suddenly a shiver went through Gary. Condition! That was something he hadn't thought about — that these other things might exact terms, might want concessions, might seek to wring front another universe some measure of profit for a service done.
He had always thought of them as benevolent beings, entities like the Engineers, living a life of service, establishing themselves as guardians of their universe. But that was it. Would they go out of their way to save another universe? Or would they fight only for their own? Was there such a thing as selflessness and universal brotherhood? Or must the universes, in time to come, be forever at one another's throats, as in ancient times nations had torn at one another in savage anger, in more recent times planets had warred for their selfish interests?
'What condition?' asked Kingsley.
'That we or they find out something concerning the nature of the inter-space and of the energy which will be generated when the universes rub,' said the Engineer. 'They are willing to come and fight for us, but they are not willing to deliberately invite disaster to themselves. No one knows what the inter-space is like. No one knows what laws of science it may hold. There may be laws that are utterly foreign to both our universes, laws that would defy our every bit of knowledge. They are afraid that the budding of a smaller universe from the surface of their own might serve to generate the energy they know will result when two four-dimensional frames draw close to one another.”
'Now, wait,' said Gary. 'There is something I didn't consider when I proposed this thing. It just occurred to me now. When you said the word 'condition,' it came to my mind that they might want concessions or promises. I was wrong, interpreted the thought wrong. But the idea is still there. We don't know what these things in the other universe might be. We don't know what they look like or what their philosophy is or what they can do. If we allowed them to come here, we'd be giving them a key to this universe. Just opening the door for them. They might be all right and they might not. They might take over the universe.”
'There's something to that,' said Tommy. 'We should have thought of it before.”
'I do not believe it,' said the Engineer. 'I have some reason to believe they would not be a menace to us.”
'What reason?' rumbled Kingsley.
'They notified us of the danger,' said the Engineer.
'They wanted help,' said Tommy.
'We have been of little help to them,' said the Engineer.
'What difference does it make?' asked Herb. 'Unless we can do something about this energy, we're going to be goners, anyhow. And that goes for the other universe as well. If they could save themselves by ruining us, maybe they'd do it, but it's a cinch that if we puff out they go along with us.”
'That's right,' agreed Kingsley. 'It would be to their interest to help us beat off the Hellhounds on the chance that we might find something to save the universes. They wouldn't be very likely to turn on us until somebody had figured out something about this energy.”
'And we can't control something we don't understand,' said Caroline. 'We have to find out what that energy is, what it's like, what form it is apt to take, something about it, so we will know how to handle it.”
'How much more time have we to find some way to save us from the big explosion?' asked Gary.
'Very little time,' said the Engineer. 'Very little time. We are perilously close to the danger point. Shortly the two space-time frames of the two universes will start reacting upon one another, creating the lines of force and
