Alvin glanced back to see if all his companions were still with him. Alystra was close behind, carrying the sphere of cold but ever-burning light that had revealed such horrors and such beauty since their adventure had begun. The pale white radiance flooded the narrow corridor and splashed from the glittering walls; while its power lasted, they could see where they were going and could detect the presence of any visible dangers. But the greatest dangers in these caves, Alvin knew too well, were not the visible ones at all.
Behind Alystra, struggling with the weight of their projectors, came Narillian and Floranus. Alvin wondered briefly why those projectors were so heavy, since it would have been such a simple matter to provide them with gravity neutralizers. He was always thinking of points like this, even in the midst of the most desperate adventures. When such thoughts crossed his mind, it seemed as if the structure of reality trembled for an instant, and that behind the world of the senses he caught a glimpse of another and totally different universe….
The corridor ended in a blank wall. Had the arrow betrayed them again? No— even as they approached, the rock began to crumble into dust. Through the wall pierced a spinning metal spear, which broadened rapidly into a giant screw. Alvin and his friends moved back, waiting for the machine to force its way into the cave. With a deafening screech of metal upon rock— which surely must echo through all the recesses of the Mountain, and waken all its nightmare brood!— the subterrene smashed through the wall and came to rest beside them. A massive door opened, and Callistron appeared, shouting to them to hurry. (“Why Callistron?” wondered Alvin. “What’s he doing here?”) A moment later they were in safety, and the machine lurched forward as it began its journey through the depths of the earth.
The adventure was over. Soon, as always happened, they would be home, and all the wonder, the terror, and the excitement would be behind them. They were tired and content.
Alvin could tell from the tilt of the floor that the subterrene was heading down into the earth. Presumably Callistron knew what he was doing, and this was the way that led to home. Yet it seemed a pity….
“Callistron,” he said suddenly, “why don’t we go upward? No one knows what the Crystal Mountain really looks like. How wonderful it would be to come out somewhere on its slopes, to see the sky and all the land around it. We’ve been underground long enough.”
Even as he said these words, he somehow knew that they were wrong. Alystra gave a strangled scream, the interior of the subterrene wavered like an image seen through water, and behind and beyond the metal walls that surrounded him Alvin once more glimpsed that other universe. The two worlds seemed in conflict, first one and then the other predominating. Then, quite suddenly, it was all over. There was a snapping, rending sensation— and the dream had ended. Alvin was back in Diaspar, in his own familiar room, floating a foot or two above the floor as the gravity field protected him from the bruising contact of brute matter.
He was himself again. This was reality— and he knew exactly what would happen next.
Alystra was the first to appear. She was more upset than annoyed, for she was very much in love with Alvin.
“Oh, Alvin!” she lamented, as she looked down at him from the wall in which she had apparently materialized, “It was such an exciting adventure! Why did you have to spoil it?”
“I’m sorry. I didn’t intend to— I just thought it would be a good idea…”
He was interrupted by the simultaneous arrival of Callistron and Floranus.
“Now listen, Alvin,” began Callistron. “This is the third time you’ve interrupted a saga. You broke the sequence yesterday by wanting to climb out of the Valley of Rainbows. And the day before you upset everything by trying to get back to the Origin in that time track we were exploring. If you won’t keep the rules, you’ll have to go by yourself.”
He vanished in high dudgeon, taking Floranus with him. Narillian never appeared at all; he was probably too fed up with the whole affair. Only the image of Alystra was left, looking sadly down at Alvin.
Alvin tilted the gravity field, rose to his feet, and walked toward the table he had materialized. A bowl of exotic fruit appeared upon it— not the food he