‘Why are you doing it, then?’ asked Hirz.
‘It certainly isn’t the money,’ I said.
‘No. I figured that part out. What, then?’
‘Old-fashioned bullheadedness, in other words,’ Celestine said.
Hirz was putting on a helmet and backpack assembly for the first time. She had just been forced to get out of her original suit and put on one of the skintights; even her small frame was now too large to pass through the constricted doors. Childe had attached some additional armour to her skintight — scablike patches of flexible woven diamond — but she must have felt more vulnerable.
I answered Celestine. ‘What about you, if it isn’t the same thing that keeps me coming back?’
‘I want to solve the problems, that’s all. For you they’re just a means to an end, but for me they’re the only thing of interest.’
I felt slighted, but she was right. The nature of the challenges was less important to me than discovering what was at the summit; the secret the Spire so jealously guarded.
‘And you’re hoping that through the problems they set us you’ll eventually understand the Spire’s makers?’
‘Not just that. I mean, that’s a significant part of it, but I also want to know what my own limitations are.’
‘You mean you want to explore the gift that the Jugglers have given you?’ Before she had time to answer I continued, ‘I understand. And it’s never been possible before, has it? You’ve only ever been able to test yourself against problems set by other humans. You could never map the limits of your ability; any more than a lion could test its strength against paper.’
She looked around her. ‘But now I’ve met something that tests me.’
‘And?’
Celestine smiled thinly. ‘I’m not sure I like it.’
We did not speak again until we had traversed half a dozen new rooms, and then rested while the shunts mopped up the excess of tiredness which came after such efforts.
The mathematical problems had now grown so arcane that I could barely describe them, let alone grope my way towards a solution. Celestine had to do most of the thinking, therefore, but the emotional strain which we all felt was just as wearying. For an hour during the rest period I teetered on the edge of sleep, but then alertness returned like a pale, cold dawn. There was something harsh and clinical about that state of mind — it did not feel completely normal — but it enabled us to get the job done, and that was all that mattered.
We continued, passing the seventieth room — fifteen further than we had reached before. We were now at least sixty metres higher than when we had entered, and for a while it looked like we had found a tempo that suited us. It was a long time since Celestine had shown any hesitation in her answers, even if it took a couple of hours for her to reach the solution. It was as if she had found the right way of thinking, and now none of the challenges felt truly alien to her. For a while, as we passed room after room, a dangerous optimism began to creep over us.
It was a mistake.
In the seventy-first room, the Spire began to enforce a new rule. Celestine, as usual, spent at least twenty minutes studying the problem, skating her fingers over the shallowly etched markings on the frame, her lips moving silently as she mouthed possibilities.
Childe studied her with a peculiar watchfulness I had not observed before.
‘Any ideas?’ he said, looking over her shoulder.
‘Don’t crowd me, Childe. I’m thinking.’
‘I know, I know. Just try and do it a little faster, that’s all.’
Celestine turned away from the frame. ‘Why? Are we on a schedule suddenly?’
‘I’m just a little concerned about the amount of time it’s taking us, that’s all.’ He stroked the bulge on his forearm. ‘These shunts aren’t perfect, and—’
‘There’s something else, isn’t there?’
‘Don’t worry. Just concentrate on the problem.’
But this time the punishment began before we had begun our solution.
It was lenient, I suppose, compared to the savage dismembering that had concluded our last attempt to reach the summit. It was more of a stern admonishment to make our selection; the crack of a whip rather than the swish of a guillotine.
Something popped out of the wall and dropped to the floor.
It looked like a metal ball, about the size of a marble. For several seconds it did nothing at all. We all stared at it, knowing that something unpleasant was going to happen, but unsure what.
Then the ball trembled, and — without deforming in any way — bounced itself off the ground to knee- height.
It hit the ground and bounced again; a little higher this time. ‘Celestine,’ Childe said, ‘I strongly suggest that you come to a decision—’
Horrified, Celestine forced her attention back to the puzzle marked on the frame. The ball continued bouncing; reaching higher each time.
‘I don’t like this,’ Hirz said.
‘I’m not exactly thrilled by it myself,’ Childe told her, watching as the ball hit the ceiling and slammed back to the floor, landing to one side of the place where it had begun its bouncing. This time its rebound was enough to make it hit the ceiling again, and on the recoil it streaked diagonally across the room, hitting one of the side walls before glancing off at a different angle. The ball slammed into Trintignant, ricocheting off his metal leg, and then connected with the walls twice — gaining speed with each collision — before hitting me in the chest. The force of it was like a hard punch, driving the air from my lungs.
I fell to the ground, emitting a groan of discomfort.
The little ball continued arcing around the room, its momentum not sapped in any appreciable way. It kept getting faster, in fact, so that its trajectory came to resemble a constantly shifting silver loom which occasionally intersected with one of us. I heard groans, and then felt a sudden pain in my leg, and the ball kept on getting faster. The sound it made was like a fusillade of gunshots, the space between each detonation growing smaller.
Childe, who had been hit himself, shouted: ‘Celestine! Make your choice!’
The ball chose that moment to slam into her, making her gasp in pain. She buckled down on one knee, but in the process reached out and palmed one of the markings on the right side of the frame.
The gunshot sounds — the silver loom — even the ball itself — vanished.
Nothing happened for several more seconds, and then the door ahead of us began to open.
We inspected our injuries. There was nothing life-threatening, but we had all been bruised badly, and it was likely that a bone or two had been fractured. I was sure I had broken a rib, and Childe grimaced when he tried to put weight on his right ankle. My leg felt tender where the ball had struck me, but I could still walk, and after a few minutes the pain abated, soothed by a combination of my own medichines and the shunt’s analgesics.
‘Thank God we’d put the helmets back on,’ I said, fingering a deep bump in the crown. ‘We’d have been pulped otherwise.’
‘Would someone please tell me what just happened?’ Celestine asked, inspecting her own wounds.
‘I guess the Spire thought we were taking too long,’ Childe said. ‘It’s given us as long as we like to solve the problems until now, but from now on it looks like we’ll be up against the clock.’
Hirz said: ‘And how long did we have?’
‘After the last door opened? Forty minutes or so.’
‘Forty-three, to be precise,’ Trintignant said.
‘I strongly suggest we start work on the next door,’ Childe said. ‘How long do you think we have, Doctor?’
‘As an upper limit? In the region of twenty-eight minutes.’
‘That’s nowhere near enough time,’ I said. ‘We’d better retreat and come back.’
‘No,’ Childe said. ‘Not until we’re injured.’
