'Yes, Doctor,' Childe said, glancing back at him. 'Way back when. Richard and I were rich kids -
relatively rich, anyway -with not enough to do. Neither of us were interested in the stock market or the
social whirl. We were only interested in games.'
'Oh. How charming. What kinds of game, might I ask?'
'We'd build simulations to test each other - extraordinarily elaborate worlds filled with subtle dangers
and temptations. Mazes and labyrinths; secret passages; trapdoors; dungeons and dragons. We'd spend
months inside them, driving each other crazy. Then we'd go away and make them even harder.'
'But in due course you grew apart,' the Doctor said. His synthesised voice had a curious piping quality.
'Yeah,' Childe said. 'But we never stopped being friends. It was just that Richard had spent so much
time devising increasingly alien scenarios that he'd become more interested in the implied psychologies
behind the tests. And I'd become interested only in the playing of the games; not their construction.
Unfortunately Richard was no longer there to provide challenges for me.'
'You were always much better than me at playing them,' I said. 'In the end it got too hard to come up
with something you'd find difficult. You knew the way my mind worked too well.'
'He's convinced that he's a failure,' Childe said, turning round to smile at the Doctor.
'As are we all,' Trintignant answered. 'And with some justification, it must be said. I have never been
allowed to pursue my admittedly controversial interests to their logical ends. You, Mister Swift, were
shunned by those who you felt should have recognised your worth in the field of speculative alien
psychology. And you, Mister Childe, have never discovered a challenge worthy of your undoubted
talents.'
'I didn't think you'd paid me any attention, Doctor.'
'Nor had I. I have surmised this much since our meeting.'
The volantor dropped below ground level, descending into a brightly lit commercial plaza lined with
shops and boutiques. With insouciant ease, Childe skimmed us between aerial walkways and then nosed
the car into a dark side-tunnel. He gunned the machine faster, our speed indicated only by the passing of
red lights set into the tunnel sides. Now and then another vehicle passed us, but once the tunnel had
branched and rebranched half a dozen times, no further traffic appeared. The tunnel lights were gone now
and when the volantor's headlights grazed the walls they revealed ugly cracks and huge, scarred absences
of cladding. These old sub-surface ducts dated back to the city's earliest days, before the domes were
thrown across the crater.
Even if I had recognised the part of the city where we had entered the tunnel system, I would have been
hopelessly lost by now.
'Do you think Childe has brought us together to taunt us about our lack of respective failures, Doctor?' I
asked, beginning to feel uneasy again despite my earlier attempts at reassurance.
'I would consider that a distinct possibility, were Childe himself not conspicuously tainted by the same
lack of success.'
'Then there must be another reason.'
'Which I'll reveal in due course,' Childe said. 'Just bear with me, will you? You two aren't the only ones
I've gathered together.'
Presently we arrived somewhere.
It was a cave in the form of a near-perfect hemisphere, the great domed roof arching a clear three
hundred metres from the floor. We were obviously well below Yellowstone's surface now. It was even
possible that we had passed beyond the city's crater wall, so that above us lay only poisonous skies.
But the domed chamber was inhabited.
The roof was studded with an enormous number of lamps, flooding the interior with synthetic daylight.
An island stood in the middle of the chamber, moated by a ring of uninviting water. A single bone-white
bridge connected the mainland to the island, shaped like a great curved femur. The island was dominated