Thursley's face fell.

"You're sure you really can't do it?" he said, and Rincewind couldn't help noticing the edge of pleading in his voice. "Even a small chest of gold would do. And, I mean, it needn't be the most beautiful woman in the whole of history. Second most beautiful would do. Or third. You pick any one out of, you know, the top one hundr - thousand. Whatever you've got in stock, sort of thing." By the end of the sentence his voice twanged with longing.

Rincewind wanted to say: Look, what you should do is stop all this messing around with chemicals in dark rooms and have a shave, a haircut, a bath, make that two baths, buy yourself a new wardrobe and get out of an evening and then - but he'd have to be honest, because even washed, shaved and soaked in body splash Thursley wasn't going to win any prizes - and then you could have your face slapped by any woman of your choice.

I mean, it wouldn't be much, but it would be body contact.

"Sorry," he said again.

Thursley sighed. "The kettle's on," he said. "Would you like a cup of tea?"

Rincewind stepped forward into a crackle of psychic energy.

"Ah," said Thursley uncertainly, as the wizard sucked his fingers, "I'll tell you what. I'll put you under a conjuration of duress."

"There's no need, I assure you."

"No, it's best this way. It means you can move around. I had it all ready anyway, in case you could go and fetch, you know, her."

"Fine," said Rincewind. As the demonologist mumbled words from the book he thought: Feet. Door. Stairs. What a great combination.

It occurred to him that there was something about the demonologist that wasn't quite usual, but he couldn't put his finger on it. He looked pretty much like the demonologists Rincewind had known back in Ankh-Morpork, who were all bent and chemical-stained and had eyes with pupils like pinheads from all the chemical fumes. This one would have fitted in easily. It was just that there was something odd.

"To be honest," said Thursley, industriously mopping away part of the circle, "you're my first demon. It's never worked before. What is your name?"

"Rincewind."

Thursley thought about this. "It doesn't ring a bell," he said. "There's a Riinjswin in the Demonologie. And a Winswin. But they've got more wings than you. You can step out now. I must say that's a first-class materialisation. No-one would think you were a fiend, to look at you. Most demons, when they want to look human, materialise in the shape of nobles, kings and princes. This moth-eaten-wizard look is very clever. You could've almost fooled me. It's a shame you can't do any of those things."

"I can't see why you'd want to live for ever," said Rincewind, privately determining that the words "moth-eaten" would be paid for, if ever he got the opportunity. "Being young again, I can understand that."

"Huh. Being young's not much fun," said Thursley, and then clapped his hand over his mouth.

Rincewind leaned forward.

About fifty years. That was what was missing.

"That's a false beard!" he said. "How old are you?"

"Eighty-seven!" squeaked Thursley.

"I can see the hooks over your ears!"

"Seventy-eight, honest! Avaunt!"

"You're a little boy!"

Eric pulled himself up haughtily. "I'm not!" he snapped. "I'm nearly fourteen!"

"Ah-ha!"

The boy waved the sword at Rincewind. "It doesn't matter, anyway!" he shouted. "Demonologists can be any age, you're still my demon and you have to do as I say!"

"Eric!" came a voice from somewhere below them.

Eric's face went white.

"Yes, mother?" he shouted, his eyes fixed on Rincewind. His mouth shaped the words: don't say anything, please.

"What's all that noise up there?"

"Nothing, mother!"

"Come down and wash your hands, dear, your breakfast's ready!"

"Yes, mother." He looked sheepishly at Rincewind. "That's my mother," he said.

"She's got a good pair of lungs, hasn't she," said Rincewind.

"I'd, I'd better go, then," said Eric. "You'll have to stay up here, of course."

It dawned on him that he was losing a certain amount of credibility at this point. He waved the sword again.

"Avaunt!" he said. "I command you not to leave this room!"

"Right. Sure," said Rincewind, eyeing the windows.

"Promise? Otherwise you'll be sent back to the Pit."

"Oh, I don't want that," said Rincewind. "Off you trot. Don't worry about me."

"I'm going to leave the sword and stuff here," said Eric, removing most of his accoutrements to reveal a slim, dark-haired young man whose face would be a lot better when his acne cleared up. "If you touch them, terrible things will befall."

"Wouldn't dream of it," said Rincewind.

When he was left alone he wandered he wandered over to the lectern and looked at the book. The title, in impressively flickering red letters, was Mallificarum Sumpta Diabolicite Occularis Singularum, the Book of Ultimate Control. He knew about it. There was a copy in the Library somewhere, although wizards never bothered with it.

This might seem odd, because if there is one thing a wizard would trade his grandfather for, it is power. But it wasn't all that strange, because any wizard bright enough to survive for five minutes was also bright enough to realise that if there was any power in demonology, then it lay with the demons. Using it for your own purposes would be like trying to beat mice to death with a rattlesnake.

Even wizards thought demonologists were odd; they tended to be surreptitious, pale men who got up to complicated things in darkened rooms and had damp, weak handshakes. It wasn't like good clean magic. No self-respecting wizard would have any truck with the demonic regions, whose inhabitants were as big a collection of ding-dong as you'd find outside a large belfry.

He inspected the skeleton closely, just in case. It didn't seem inclined to make a contribution to the situation.

"It belonged to his wossname, grandfather," said a cracked voice behind him

"Bit of an unusual bequest," said Rincewind.

"Oh, not personally. He got it in a shop somewhere. It's one of them wossname, articulate wossnames."

"It's not saying much right now," said Rincewind, and then went very quiet and thoughtful.

"Er," he said, without moving his head, "what, precisely, am I talking to?"

"I'm a wossname. Tip of my tongue. Begins with a P."

Rincewind turned around slowly.

"You're a parrot?" he said.

"That's it."

Rincewind stared at the thing on the perch. It had one eye that glittered like a ruby. Most of the rest of it was pink and purple skin, studded with the fag-ends of feathers, so that the net effect was of an oven-ready hairbrush. It jiggled arthritically on its perch and then slowly lost its balance, until it was hanging upside down.

"I thought you were stuffed," said Rincewind.

"Up yours, wizard."

Rincewind ignored it and crept over to the window. It was small, but gave out on to a gently sloping roof. And out there was a real life, real sky, real buildings. He reached out to open the shutters -

A crackling current coursed up his arm and earthed itself in his cerebellum.

He sat on the floor, sucking his fingers.

"He tole you," said the parrot, swinging backwards and forwards upside down. "But you wouldn't wossname. He's got you by the wossnames."

"But it should only work on demons!"

"Ah," said the parrot, achieving enough momentum to swing upright again, whereupon it steadied itself with the stubby remains of what had once been wings. "It's all according, isn't it. If you come in the door marked ‘wossnames' that means you get treated as a wossname, right? Demon, I mean. Subject to all the rules and wossnames. Tough one for you."

"But you know I'm a wizard, don't you!"

The parrot gave a squawk. "I've seen ‘em, mate. The real McWossname. Some of the ones we've had in here, they'd make you choke on your millet. Great scaly fiery wossnames. Took weeks to get the soot off the walls," it added, in an approving tone of voice. "That was in his granddad's day, of course. The kid hasn't been any good at it. Up to now. Bright lad. I blame the wossnames, parents. New money, you know. Wine business. Spoil him rotten, let him play with his wossname's old stuff, ‘Oh, he's such an intelligent lad, nose always in a book'," the parrot mimicked. "They never give him any of the things a sensitive growing wossname really needs, if you was to ask me."