On the other hand, it is perfectly possible to sit all day, every day, on top of another creature and not have the slightest thought about them whatsoever.

When the early models of these Monks were built, it was felt to be important that they be instantly recognisable as artificial objects.

There must be no danger of their looking at all like real people. You wouldn't want your video recorder lounging around on the sofa all day while it was watching TV. You wouldn't want it picking its nose, drinking beer and sending out for pizzas.

So the Monks were built with an eye for originality of design and also for practical horse-riding ability. This was important. People, and indeed things, looked more sincere on a horse. So two legs were held to be both more suitable and cheaper than the more normal primes of seventeen, nineteen or twenty-three; the skin the Monks were given was pinkish-looking instead of purple, soft and smooth instead of crenellated. They were also restricted to just one mouth and nose, but were given instead an additional eye, making for a grand total of two.

A strange-looking creature indeed. But truly excellent at believing the most preposterous things.

This Monk had first gone wrong when it was simply given too much to believe in one day. It was, by mistake, cross-connected to a video recorder that was watching eleven TV channels simultaneously, and this caused it to blow a bank of illogic circuits. The video recorder only had to watch them, of course. It didn't have to believe them all as well. This is why instruction manuals are so important.

So after a hectic week of believing that war was peace, that good was bad, that the moon was made of blue cheese, and that God needed a lot of money sent to a certain box number, the Monk started to believe that thirty-five percent of all tables were hermaphrodites, and then broke down. The man from the Monk shop said that it needed a whole new motherboard, but then pointed out that the new improved Monk Plus models were twice as powerful, had an entirely new multi-tasking Negative Capability feature that allowed them to hold up to sixteen entirely different and contradictory ideas in memory simultaneously without generating any irritating system errors, were twice as fast and at least three times as glib, and you could have a whole new one for less than the cost of replacing the motherboard of the old model.

That was it. Done.

The faulty Monk was turned out into the desert where it could believe what it liked, including the idea that it had been hard done by. It was allowed to keep its horse, since horses were so cheap to make.

For a number of days and nights, which it variously believed to be three, forty-three, and five hundred and ninety-eight thousand seven hundred and three, it roamed the desert, putting its simple Electric trust in rocks, birds, clouds and a form of non-existent elephantasparagus, until at last it fetched up here, on this high rock, overlooking a valley that was not, despite the deep fervour of the Monk's belief, pink. Not even a little bit.

Time passed.

Time passed.

Susan waited.

The more Susan waited, the more the doorbell didn't ring. Or the phone. She looked at her watch. She felt that now was about the time that she could legitimately begin to feel cross. She was cross already, of course, but that had been in her own time, so to speak. They were well and truly into his time now, and even allowing for traffic, mishaps, and general vagueness and dilatoriness, it was now well over half an hour past the time that he had insisted was the latest time they could possibly afford to leave, so she'd better be ready.

She tried to worry that something terrible had happened to him, but didn't believe it for a moment. Nothing terrible ever happened to him, though she was beginning to think that it was time it damn well did. If nothing terrible happened to him soon maybe she'd do it herself. Now there was an idea.

She threw herself crossly into the armchair and watched the news on television. The news made her cross. She flipped the remote control and watched something on another channel for a bit. She didn't know what it was, but it also made her cross. Perhaps she should phone. She was damned if she was going to phone. Perhaps if she phoned he would phone her at the same moment and not be able to get through.

She refused to admit that she had even thought that.

Damn him, where was he? Who cared where he was anyway? She didn't, that was for sure.

Three times in a row he'd done this. Three times in a row was enough. She angrily flipped channels one more time. There was a programme about computers and some interesting new developments in the field of things you could do with computers and music.

That was it. That was really it. She knew that she had told herself that that was it only seconds earlier, but this was now the final real ultimate it.

She jumped to her feet and went to the phone, gripping an angry Filofax. She flipped briskly through it and dialed a number.

«Hello, Michael? Yes, it's Susan. Susan Way. You said I should call you if I was free this evening and I said I'd rather be dead in a ditch, remember? Well, I suddenly discover that I am free, absolutely, completely and utterly free, and there isn't a decent ditch for miles around. Make your move while you've got your chance is my advice to you. I'll be at the Tangiers Club in half an hour.»

She pulled on her shoes and coat, paused when she remembered that it was Thursday and that she should put a fresh, extra-long tape on the answering machine, and two minutes later was out of the front door.

When at last the phone did ring the answering machine said sweetly that Susan Way could not come to the phone just at the moment, but that if the caller would like to leave a message, she would get back to them as soon as possible. Maybe.

It was a chill November evening of the old-fashioned type.

The moon looked pale and wan, as if it shouldn't be up on a night like this. It rose unwillingly and hung like an ill spectre.

Silhouetted against it, dim and hazy through the dampness which rose from the unwholesome fens, stood the assorted towers and turrets of St Cedd's, Cambridge, a ghostly profusion of buildings thrown up over centuries, medieval next to Victorian, Odeon next to Tudor. Only rising through the mist did they seem remotely to belong to one another.

Between them scurried figures, hurrying from one dim pool of light to another, shivering, leaving wraiths of breath which folded themselves into the cold night behind them.

It was seven o'clock. Many of the figures were heading for the college dining hall which divided First Court from Second Court, and from which warm light, reluctantly, streamed. Two figures in particular seemed ill-matched. One, a young man, was tall, thin and angular; even muffled inside a heavy dark coat he walked a little like an affronted heron.

The other was small, roundish, and moved with an ungainly restlessness, like a number of elderly squirrels trying to escape from a sack. His own age was on the older side of completely indeterminate.

If you picked a number at random, he was probably a little older than that, but — well, it was impossible to tell. Certainly his face was heavily lined, and the small amount of hair that escaped from under his red woollen skiing hat was thin, white, and had very much its own ideas about how it wished to arrange itself. He too was muffled inside a heavy coat, but over it he wore a billowing gown with very faded purple trim, the badge of his unique and peculiar academic office.