“They’re coming!” she screamed about the din. “They’re coming now!”

She scrambled out from behind the table where she had taken refuge from the magical duel and tried to reach Granny. A gust of raw magic lifted her off her feet and bowled her into a chair.

The buzzing was louder now, so that the air roared like a three-week corpse on a summer’s day. Esk made another attempt to reach Granny and recoiled when green fire roared along her arm and singed her hair.

She looked around wildly for the other wizards, but those who had fled from the effects of the magic were cowering behind overturned furniture while the occult storm raged over their heads.

Esk ran down the length of the hall and out into the dark corridor. Shadows curled around her as she hurried, sobbing, up the steps and along the buzzing corridors towards Simon’s narrow room.

Something would try to enter the body, Granny had said. Something that would walk and talk like Simon, but would be something else ….

A cluster of students were hovering anxiously outside the door. They turned pale faces towards Esk as she darted towards them, and were sufficiently shaken to draw back nervously in the face of her determined progress.

“Something’s in there,” said one of them.

“We can’t open the door!”

They looked at her expectantly. Then one of them said: “You wouldn’t have a pass key, by any chance?”

Esk grabbed the doorhandle and turned it. It moved slightly, but then spun back with such force it nearly took the skin off her hands. The chittering inside rose to a crescendo and there was another noise, too, like leather flapping.

“You’re wizards!” she screamed. “Bloody well wizz!”

“We haven’t done telekinesis yet,” said one of them.

“I was ill when we did Firethrowing—”

“Actually, I’m not very good at Dematerialisation—”

Esk went to the door, and then stopped with one foot in the air. She remembered Granny talking about how even buildings had a mind, if they were old enough. The University was very old.

She stepped carefully to one side and ran her hands over the ancient stones. It had to be done carefully, so as not to frighten it—and now she could feel the mind in the stones, slow and simple, but still mind. It pulsed around her; she could feel the little sparkles deep in the rock.

Something was hooting behind the door.

The three students watched in astonishment as Esk stood rock still with her hands and forehead pressed against the wall.

She was almost there. She could feel the weight of herself, the ponderousness of her body, the distant memories of the dawn of time when rock was molten and free. For the first time in her life she knew what it was like to have balconies.

She moved gently through the building-mind, refining her impressions, looking as fast as she dared for this corridor, this door.

She stretched out one arm, very carefully. The students watched as she uncurled one finger, very slowly.

The door hinges began to creak.

There was a moment of tension and then the nails sprang from the hinges and clattered into the wall behind her. The planks began to bend as the door still tried to force itself open against the strength of -whatever was holding it shut.

The wood billowed.

Beams of blue light lanced out into the corridor, moving and dancing as indistinct shapes shuffled through the blinding brilliance inside the room. The light was misty and actinic, the sort of light to make Steven Spielberg reach for his copyright lawyer.

Esk’s hair leapt from her head so that she looked like an ambulant dandelion. Little firesnakes of magic crackled across her skin as she stepped through the doorway.

The students outside watched in horror as she disappeared into the light.

It vanished in a silent explosion.

When they eventually found enough courage to look inside the room, they saw nothing there but the sleeping body of Simon. And Esk, silent and cold on the floor, breathing very slowly. And the floor was covered with a fine layer of silver sand.

Esk floated through the mists of the world, noticing with a curious impersonal feeling the precise way in which she passed through solid matter.

There were others with her. She could hear their chittering.

Fury rose like bile. She turned and set out after the noise, fighting the seductive forces that kept telling her how nice it would be just to relax her grip on her mind and sink into a warm sea of nothingness. Being angry, that was the thing. She knew it was most important to stay really angry.

The Discworld fell away, and lay below her as it did on the day she had been an eagle. But this time the Circle Sea was below her—it certainly was circular, as if God had run out of ideas—and beyond it lay the arms of the continent, and the long chain of the Ramtops marching all the way to the Hub. There were other continents she had never heard of, and tiny island chains.

As her point of view changed, the Rim came into sight. It was night time and, since the Disc’s orbiting sun was below the world, it lit up the long waterfall that girdled the Edge.

It also lit up Great A’Tuin the World Turtle. Esk had often wondered if the Turtle was really a myth. It seemed a lot of trouble to go to just to move a world. But there It was, almost as big as the Disc it carried, frosted with stardust and pocked with meteor craters.

Its head passed in front of her and she looked directly into an eye big enough to float all the fleets in the world. She had heard it said that if you could look far enough into the direction that Great A’Tuin was staring, you would see the end of the universe. Maybe it was just the set of its beak, but Great A’Tuin looked vaguely hopeful, even optimistic. Perhaps the end of everything wasn’t as bad as all that.

Dreamlike, she reached out and tried to Borrow the biggest mind in the universe.

She stopped herself just in time, like a child with a toy toboggan who expected a little gentle slope and suddenly looks out of the magnificent mountains, snow-covered, stretching into the icefields of infinity. No one would ever Borrow that mind, it would be like trying to drink all the sea. The thoughts that moved through it were as big and as slow as glaciers.

Beyond the Disc were the stars, and there was something wrong with them. They were swirling like snowflakes. Every now and again they would settle down and look as immobile as they always did, and then they’d suddenly take it into their heads to dance.

Real stars shouldn’t do that, Esk decided. Which meant she wasn’t looking at real stars. Which meant she wasn’t exactly in a real place. But a chittering close at hand reminded her that she could almost certainly really die if she once lost track of those noises. She turned and pursued the sounds through the stellar snowstorm.

And the stars jumped, and settled, jumped, and settled ….

As she swooped upward Esk tried to concentrate on everyday things, because if she let her mind dwell on precisely what it was she was following then she knew she would turn back, and she wasn’t sure she knew the way. She tried to remember the eighteen herbs that cured ear-ache, which kept her occupied for a while because she could never recall the last four.

A star swooped past, and then was violently jerked away; it was about twenty feet across.

When she ran out of herbs she started on the diseases of goats, which took quite a long time because goats can catch a lot of things that cows can catch plus a lot of things plus that sheep plus catch plus a complete range of horrible ailments of their very own. When she had finished listing wooden udder, ear wilt and the octarine garget she tried to recall the complex code of dots and lines that they used to cut in the trees around Bad Ass, so that lost villagers could find their way home on snowy nights.