The Lecturer in Recent Runes fumbled in the capacious pockets of his robe. "Oh dear, I believe I have a bottle of something . . . the sea always affects me that way, too."

"I was rather thinking of problems associated with the thin air and low gravity," said Leonard. "That's what the survivor of the Maria Pesto reported. But this afternoon I feel I can come up with a privy that, happily, utilises the thinner air of altitude to achieve the effect normally associated with gravity. Gentle suction is involved."

Ponder nodded. He had a quick mind when it came to mechanical detail, and he'd already formed a mental picture. Now a mental eraser would be useful, "Er . . . good," he said. "Well, most of the ships will fall behind the barge during the night. Even with magically assisted wind we dare not venture closer than thirty miles to the Rim. After that, we could be caught in the current and swept over the Edge."

Rincewind, who had been leaning moodily over the rail and watching the water, turned at this.

"How far are we from the island of Krull?" he said.

"That place? Hundreds of miles," said Ponder. "We want to keep well away from those pirates."

"So . . . we'll run straight into the Circumfence, then?"

There was technically silence, although it was loud with unspoken thoughts. Each man was busy trying to think of a reason why it would have been far too much to expect him to have thought of this, while at the same time being a reason why someone else should have. The Circumfence was the biggest construction ever built; it extended almost a third of the way around the world. On the large island of Krull, an entire civilisation lived on what they recovered from it. They ate a lot of sushi, and their dislike for the rest of the world was put down to permanent dyspepsia.

In his chair, Lord Vetinari grinned in a thin, acid way.

"Yes indeed," he said. It extends for several thousands of miles, I understand. However, I gather the Krullians no longer keep captive seamen as slaves. They simply charge ruinous salvage rates."

"A few fireballs would blow the thing apart," said Ridcully.

"That does rather require you to be very close to it, though," said Lord Vetinari. "That is to say, so close to the Rimfall that you would be destroying the very thing that is preventing you from being swept over the Edge. A knotty problem, gentlemen."

"Magic carpet," said Ridcully. "Just the job. We've got one in ―"

"Not that close to the Edge, sir," said Ponder, dismally. "The thaumic field is very thin and there are some ferocious air currents."

There was the crisp rattle of a big drawing pad being turned to the next page.

"Oh, yes," said Leonard, more or less to himself.

"Pardon me?" said the Patrician.

"I did once design a simple means whereby entire fleets could be destroyed quite easily, my lord. Only as a technical exercise, of course."

"But with numbered parts and a list of instructions?" said the Patrician.

"Why, yes , my lord. Of course. Otherwise it would not be a proper exercise. And I feel sure that with the help of these magical gentlemen we should be able to adapt it for this purpose."

He gave them a bright smile. They looked at his drawing. Men were leaping from ships in flames, into a boiling sea.

"You do this sort of thing as a hobby, do you?" said the Dean.

"Oh, yes. There are no practical applications."

"But couldn't someone build something like that?" said the Lecturer in Recent Runes. "You practically include glue and transfers!"

"Well, I daresay there are people like that," said Leonard diffidently. "But I am sure the government would put a stop to things before they went too far."

And the smile on Lord Vetinari's face was one that probably even Leonard of Quirm, with all his genius, would never be able to capture on canvas.

Very carefully, knowing that if they dropped one they probably wouldn't even know they'd dropped one, a team of students and apprentices lifted the cages of dragons into the racks under the rear of the flying machine. Occasionally one of the dragons hiccuped. Everyone present, bar one, would freeze. The exception was Rincewind, who would be crouched down behind a pile of timber many yards away.

"They've all been well fed on Leonard's special feed and should be quite docile for four or five hours," said Ponder, pulling him out for the third time. "The first two stages were given their meals with a carefully timed interval, and the first lot should be in a mood to flame just as you go over the Rimfall."

"What if we're delayed?"

Ponder gave this some deep thought.

"Whatever you do, don't be delayed," he said.

"Thank you."

"The ones that you'll be taking with you in flight may need feeding, too. We've loaded a mixture of naphtha, rock oil and anthracite dust."

"For me to feed to the dragons."

"Yes."

"In this wooden ship, which will be very, very high?"

"Well, in a technical sense, yes."

"Could we focus on that technicality?"

"Strictly speaking, there won't be any down. As such. Er . . . you could say that you will be travelling so fast that you won't be in any one place long enough to fall down." Ponder sought a glimmer of understanding in Rincewind's face. "Or, to put in another way, you'll be falling permanently without ever hitting the ground."

Up above them, rack on rack of dragons sizzled contentedly. Wisps of steam drifted through the shadows.

"Oh," said Rincewind.

"You understand?" said Ponder.

"No. I was just hoping that if I didn't say anything you'd stop trying to explain things to me."

"How are we doing, Mr Stibbons?" said the Archchancellor, strolling up at the head of his wizards. "How's our enormous kite?"

"Everything's going to plan, sir. We're at T minus five hours, sir."

"Really? Good. We're at supper in ten minutes."

Rincewind had a small cabin, with cold water and running rats. Most of it that wasn't occupied by his bunk was occupied by his luggage. The Luggage.

It was a box that walked around on hundreds of little legs. It was magical, as far as he knew. He'd had it for years. It understood every word he said. It obeyed about one in every hundred, unfortunately.

"There won't be any room ," he said. "And you know every time you've gone up in the air you've got lost."

The Luggage watched him in its eyeless way.

"So you stay with nice Mr Stibbons, all right? You've never been at ease around gods, either. I shall be back very soon."

Still the eyeless stare went on.

"Just don't look at me that way, will you?" said Rincewind.

Lord Vetinari cast his eye over the three . . . what was the word?

"Men," he said, settling for one that was undoubtedly correct, "it falls to me to congratulate you on . . . on . . ."

He hesitated. Lord Vetinari was not a man who delighted in the technical. There were two cultures, as far as he was concerned. One was the real one, the other was occupied by people who liked machinery and ate pizza at unreasonable hours.

" . . . on being the first people to leave the Disc with the resolute intention of returning to it," he went on. "Your . . . mission is to land on or near Con Celesti, locate Cohen the Barbarian and his men, and by whatever means feasible stop this ridiculous scheme of theirs. There must be some misunderstanding. Even barbarian heroes generally draw the line at blowing up the world." He sighed. "They're usually not civilised enough for that," he added. "Anyway . . . we implore him to listen to reason, et cetera. Barbarians are generally sentimentalists. Tell him about all the dear little puppies that will be killed, or something. Beyond that, I can't advise you further. I suspect classical force is out of the question. If Cohen was easy to kill, people would have done it a long time ago."

Captain Carrot saluted. "Force is always the last resort, sir," he said.

"I believe that for Cohen it's the first choice," said Lord Vetinari.

"He's not too bad if you don't come up behind him suddenly," said Rincewind.

"Ah, there is the voice of our mission specialist," said the Patrician. "I just hope ― What is that on your badge, Captain Carrot?"

"Mission motto, sir," said Carrot cheerfully. "MorituriNolumus Mori . Rincewind suggested it."

"I imagine he did," said Lord Vetinari, observing the wizard coldly. "And would you care to give us a colloquial translation, Mr Rincewind?"

"Er . . ." Rincewind hesitated, but there really was no escape. "Er . . . roughly speaking, it means, 'We who are about to die don't want to', sir."

"Very clearly expressed. I commend your determination . . . Yes?"

Ponder had whispered something in his ear.

"Ah, I'm informed that we have to leave you shortly," said Lord Vetinari. "Mr Stibbons tells me that there is a means of keeping in touch with you, at least until you're close to the mountain."

"Yes, sir," said Carrot. "The fractured omniscope. An amazing device. Each part sees what the other parts sees. Astonishing."

"Well, I trust your new careers will be uplifting if not, ahaha, meteoric. To your places, gentlemen."

"Er . . . I just want to take an iconograph, sir," said Ponder, hurrying forward and clutching a large box. "To record the moment? If you would all stand in front of the flag and smile, please . . . that means the corners of your mouth go up , Rincewind . . . thank you." Ponder, like all bad photographers, took the shot just a fraction of a second after the smiles had frozen. "And do you have any last words?"

"You mean, last words before we go and come back?" said Carrot, his brow wrinkling.

"Oh, yes. Of course. That's what I meant! Because of course you will be coming back, won't you?" said Ponder, far too quickly in Rincewind's opinion. "I have absolute confidence in Mr da Quirm's work, and I'm sure he has too."

"Oh, dear. No, I never bother to have any confidence," said Leonard.

"You don't?"

"No, things just work. You don't have to wish," said Leonard. "And, of course, if we do fail, then things won't be that bad, will they? If we fail to come back, there won't be anywhere left to fail to come back to in any case, will there? So it will all cancel out." He gave his happy little smile. "Logic is a great comfort in times like this, I always find."

"Personally," said Captain Carrot, "I am happy, thrilled and delighted to be going." He tapped a box by his side. "And I am, as instructed, also bringing along an iconograph and intend to take many useful and deeply moving images of our world from the perspective of space which will perhaps cause us to see humanity in an entirely new light."

"Is this the time to resign from the crew?" said Rincewind, staring at his fellow voyagers.

"No," said Lord Vetinari.

"Possibly on grounds of insanity?"

"Your own, I assume?"

"Take your pick!"

Vetinari beckoned Rincewind forward.

"But it could be said that someone would have to be insane to take part in this venture," he murmured. "In which case, of course, you are fully qualified."

"Then . . . supposing I'm not insane?"

"Oh, as ruler of Ankh-Morpork I have a duty to send only the keenest, coolest minds on a vital errand of this kind."

He held Rincewind's gaze for a moment.

"I think there's a catch there," said the wizard, knowing that he'd lost.

"Yes. The best kind there is," said the Patrician.

The lights of the anchored ships disappeared into the murk as the barge drifted on, faster now as the current began to pull.

"No turning back now," said Leonard.

There was a roll of thunder, and fingers of lightning walked along the Edge of the world.

"Just a squall, I expect," he added, as fat drops of rain thudded on the tarpaulins. "Shall we get aboard? The draglines will keep us pointed directly at the Rim, and we might as well make ourselves comfortable while we wait."

"We ought to release the fire boats first, sir," said Carrot.

"Silly me, yes," said Leonard. "I'd forget my own head if it was wasn't held on with bones and skin and things!"

A couple of ship's boats had been sacrificed for the attempt on the Circumfence. They wallowed slightly, laden as they were with spare tins of varnish, paint and the remains of the dragons" supper. Carrot picked up a couple of lanterns and, after a couple of tries in the gusting wind, managed to light them and place them carefully according to Leonard's instructions.

Then the boats were cast adrift. Freed of the drag of the barge, they pulled away in the quickening current.

The rain was hammering down now.

"And now let us get aboard," said Leonard, ducking back out of the rain. "A cup of tea will do us good."

"I thought we decided we couldn't have any naked flames on board, sir," said Carrot.

"I have brought along a special jug of my own devising which keeps things warm," said Leonard. "Or cold, if you prefer. I call it the Hot or Cold Flask. I am at a loss as to how it knows which it is that you prefer, but nevertheless it seems to work."

He led the way up the ladder.

Only one small lamp lit the little cabin. It illuminated three seats, embedded among a network of levers, armatures and springs.

The crew had been up here before. They knew the layout. There was one little bed further aft, on the basis that there would only be time for any one person to be asleep. String bags had been stapled to every bit of unused wall to hold water bottles and food. Unfortunately, some of Lord Vetinari's committees, devised in order to prevent their members from interfering with anything important, had turned their attention to provisioning the craft. It appeared packed for every eventuality, including alligator-wrestling on a glacier.

Leonard sighed.

"I really didn't like to say no to anyone." he said, "I did suggest that, er, nourishing but concentrated and, er, low-residue food would be preferred ―"

As one man, they turned in their seats to look at the Experimental Privy Mk 2. Mk 1 had worked ― Leonard's devices tended to ― but since a key to its operation was that it tumbled very fast on a central axis while in use it had been abandoned after a report by its test pilot (Rincewind) that, whatever you had in mind when you went in, the only thing you wanted to do once inside was get out.

Mk 2 was as yet untried. It creaked ominously under their gaze, an open invitation to constipation and kidney stones.

"It will undoubtedly function," said Leonard, and just this once Rincewind noted the harmonic of uncertainty. "It is all just a matter of opening the correct valves in sequence."

"What happens if we don't open the right valves in sequence, sir?" said Carrot, buckling himself in.

"You must appreciate that I have had to design so many things for this craft ―" Leonard began.

"We'd still like to know," said Rincewind.

"Er . . . in truth, what happens if you don't open the right valves in sequence is that you will wish you had opened the right valves in sequence," said Leonard. He fumbled below his seat and produced a large metal flask of curious design. "Tea, anyone?" he said.

"Just a small cup," said Carrot firmly.

"Make mine a spoonful," said Rincewind. "And what's this thing hanging in the ceiling in front of me?"

"It's my new device for looking behind you," said Leonard. "It's very simple to use. I call it the Device For Looking Behind You."

"Looking behind you is a bad move," said Rincewind firmly. "I've always said so. It slows you down."

"Ah, but this way we won't slow down at all."

"Really?" said Rincewind, brightening up.

A squall of rain banged on the tarpaulins. Carrot tried to see ahead. A gap had been cut in the covers so that the ―

"By the way . . . what are we?" he said. "I mean, what do we call ourselves?"

"Possibly foolish." said Rincewind.

"I meant officially ." Carrot looked around the crammed cabin. "And what do we call this craft?"

"The wizards call it the big kite," said Rincewind. "But it's nothing like a kite, a kite is something on a string which ―"

"It has to have a name," said Carrot. "It's very bad luck to attempt a voyage in a vessel with no name."

Rincewind looked at the levers in front of his seat. They had to do mainly with dragons. "We're in a big wooden box and behind us are about a hundred dragons who are getting ready to burp," he said. "I think we need a name. Er . . . do you actually know how to fly this thing, Leonard?"

"Not as such, but I intend to learn very soon."

"A really good name," said Rincewind fervently. Ahead of them the stormy horizon was lit by an explosion. The boats had hit the Circumfence, and burst into fierce, corrosive flame. "Right now ." he added.

"The kite, the real kite, is a very beautiful bird," said Leonard. "It's what I had in mind when I ―"

"The Kite it is, then," said Carrot firmly. He glanced at a list pinned in front of him and ticked off one item. "Shall I drop the tarpaulin anchor, sir?"

"Yes. Er. Yes. Do that," said Leonard. Carrot pulled a lever. Below and behind them there was the sound of a splash, and then of cable running out very fast "There's a reef! There's rocks!" Rincewind stood up, pointing.

The firelight ahead glowed on something squat and immovable, surrounded by surf.

"No turning back," said Leonard as the sinking anchor dragged the Kite 's coverings off like an enormous canvas egg. He reached out and pulled handles and knobs like an organist in full fugue.

"Number One Blinkers . . . down. Tethers . . . off. Gentlemen, each pull those big handles beside you when I say . . ."

The rocks loomed. The white water at the lip of the endless Fall was red with fire and glowing with lightning. Jagged rocks were a few yards away, hungry as a crocodile's teeth.

"Now! Now! Now! Mirrors . . . down! Good! We have flame! Now what was it . . . oh, yes . . . Everyonehold on to something!"

Wings unfolding, dragons flaring, the Kite rose from the splintering barge and into the storm and over the Rim of the world . . .

The only sound was a faint whisper of air as Rincewind and Carrot clambered off the shivering floor. Their pilot was staring out of the window.

"Look at the birds! Oh, do look at the birds!"

In the calm sunlit air beyond the storm they swooped and turned in their thousands around the gliding ship, as small birds will mob an eagle. And it did look like an eagle, one that had just snatched a giant salmon from the Fall . . .

Leonard stood entranced, tears running down his cheeks.

Carrot tapped him very gently on the shoulder. "Sir?"

"It's so beautiful . . . so beautiful . . ."

"Sir, we need you to fly this thing, sir! Remember? Stage Two?"

"Hmm?" Then the artist shuddered, and part of him returned to his body. "Oh, yes, very well, very well . . ." He sat down heavily in his seat. "Yes . . . to be sure . . . yes. We shall, er, we shall test the controls. Yes."

He laid a trembling hand on the levers in front of him, and placed his feet on the pedals. The Kite lurched sideways on the air.

"Oops . . . ah, now I think I have it . . . sorry . . . yes . . . oh, sorry, dear me . . . ah, now I think . . ."

Rincewind, flung against the window by another judder, looked down the face of the Rimfall.

Here and there, all the way down, mountain-sized islands projected from the wall of white water, glowing in the evening light. Little white clouds scudded between them. And everywhere there were birds, wheeling, nesting, gliding ―

"There's forests on those rocks! They're like little countries . . . there's people! I can see houses!"

He was thrown back again as the Kite banked into some cloud.

"There's people living over the Edge!" he said.

"Old shipwrecks, I suppose," said Carrot.

"I, er, I think I have the hang of it now," said Leonard, staring fixedly ahead. "Rincewind, please be so good as to pull that lever there, will you?"

Rincewind did so. There was a clunk behind them, and the ship shook slightly as the first-stage cage was dropped.

As it tumbled slowly apart in the air, small dragons spread their wings and flapped hopefully back towards the Disc.

"I thought there would be more than that," said Rincewind.

"Oh, those are just the ones we used to help us get clear of the Rim," said Leonard, as the Kite turned lazily in the air. "Most of the others we'll use to go down."

"Down?" said Rincewind.

"Oh, yes. We need to go down, as quickly as we can. No time to waste."

"Down? This is not the time to talk about down! You kept on talking about around . Around is fine! Not down!"

"Ah, but you see, in order to go around we need to go down . Fast." Leonard looked reproachful. "I did put it in my notes ―"

"Down is not a direction with which I am happy!"

"Hello? Hello?" came a voice, out of the air.

"Captain Carrot," said Leonard, as Rincewind sulked in his seat, "oblige me by opening the cabinet there, will you?"

This revealed a fragment of smashed omniscope and the face of Ponder Stibbons.

"It works!" His shout sounded muffled and somehow small, like the squeaking of an ant. "You're alive?"

"We have separated the first dragons and everything is going well, sir," said Carrot.

"No, it's not!" Rincewind shouted. "They want to go dow― !"

Without turning his head, Carrot reached around behind Leonard and pulled Rincewind's hat down over his face.

"The second-stage dragons will be about ready to burn now," said Leonard. "We had better get on, Mr Stibbons."

"Please take careful observations of all ―" Ponder began, but Leonard had politely closed the case.

"Now then," he said, "if you gentlemen will undo the clips beside you and turn the large red handles you should be able to start the process of folding the wings back in. I believe that as we increase speed the impellers will make the process easier." He looked at Rincewind's blank face as the angry wizard freed himself from his hat. "We will use the rushing air as we fall to help us reduce the size of the wings, which we will not require for a while."

"I understand that," said Rincewind distantly. "I just hate it."

"The only way home is down, Rincewind," said Carrot, adjusting his seat belt. "And put your helmet on!"

"So if everyone would once again hold tight?" said Leonard, and pushed gently on a lever. "Don't look so worried, Rincewind. Think of it as a sort of . . . well, a magic carpet ride . . ."

The Kite shuddered.

And dived . . .

And suddenly the Rimfall was under them, stretching to an infinite misty horizon, its rocky outcrops now islands in a white wall.

The ship shook again, and the handle Rincewind had been leaning on started to move under its own power.

There was no solid surface any more. Every piece of the ship was vibrating.

He stared out of the porthole next to him. The wings, the precious wings, the things that kept you up, were folding gracefully in on themselves . . .

"Rrincewwind," said Leonard, a blur in his seat, "pplease ppull the bblack lleverr!"

The wizard did so, on the basis that it couldn't make things worse.

But it did. He heard a series of thumps behind him. Five score of dragons, having recently digested a hydrocarbon-rich meal, saw their own reflections in front of them as a rack of mirrors was, for a moment, lowered in front of their cages.

They flared.

Something crashed and smashed, back in the fuselage. A giant foot pressed the crew back into their seats. The Rimfall blurred. Through red-rimmed eyes they stared at the speeding white sea and the distant stars and even Carrot joined in the hymn of terror, which goes: "Aaaaaaaaaahhhhhhhhhhggggggg . . ."

Leonard was trying to shout something. With terrible effort Rincewind turned his huge and heavy head and just made out the groan: "Ttthe wwwhite lllever!"

It took him years to reach it. For some reason his arms had been made out of lead. Bloodless fingers with muscles weak as string managed to get a grip and tow the lever back.

Another foreboding thump rattled the ship. The pressure ceased. Three heads thumped forward.

And then there was silence. And lightness. And peace.

Dreamily, Rincewind pulled down the periscope and saw the huge fish section curving gently away from them. It came apart as it flew, and more dragons spread their wings and whirled away behind the Kite . Magnificent. A device for seeing behind you without slowing down? Just the thing no coward should be without.

"I've got to get one of these," he murmured.

"That seemed to go quite well, I thought," said Leonard. "I'm sure the little creatures will get back, too. Flitting from rock to rock . . . yes, I'm sure they will . . ."

"Er . . . there's a strong draught by my seat ―" Carrot began.

"Ah, yes . . . it would be a good idea to keep the helmets handy," Leonard said. "I've done my best, varnishing and laminating and so forth . . . but the Kite is not, alas, completely airtight. Well, here we are, well on our way," he added brightly. "Breakfast, anyone?"

"My stomach feels very ―" Rincewind began, but stopped.

A spoon drifted past, tumbling gently.

"What has switched off the down-ness?" he demanded.

Leonard opened his mouth to say: No, this was expected, because everything is falling at the same speed, but he didn't, because he could see this was not a happy thing to say.

"It's the sort of thing that happens," he said. "It's . . . er . . . magic."

"Oh. Really? Oh."

A cup bumped gently off Carrot's ear. He batted it away and it disappeared somewhere aft.

"What kind of magic?" he said.