Someone whispered, 'I told you—'
There was a tiny grinding noise, and a click.
Rincewind's face was a mask. Perspiration dripped off his chin.
There was another click, and the grinding of reluctant spindles. Trymon had oiled the lock, but the oil had been soaked up by the rust and dust of years, and the only way for a wizard to move something by magic, unless he can harness some external movement, is to use the leverage of his mind itself.
Rincewind was trying very hard to prevent his brain being pushed out of his ears.
The lock rattled. Metal rods flexed in pitted groves, gave in, pushed levers.
Levers clicked, notches engaged. There was a long drawn-out grinding noise that left Rincewind on his knees.
The door swung open on pained hinges. The wizards sidled out cautiously.
Twoflower and Bethan helped Rincewind to his feet. He stood grey-faced and swaying.
'Not bad,' said one of the wizards, looking closely at the lock. 'A little slow, perhaps.'
'Never mind that!' snapped Jiglad Wert. 'Did you three see anyone on the way down here?'
'No,' said Twoflower.
'Someone has stolen the Octavo.'
Rincewind's head jerked up. His eyes focussed.
'Who?'
'Trymon —'
Rincewind swallowed. 'Tall man?' he said. 'Fair hair, looks a bit like a ferret?'
'Now that you mention it —'
'He was in my class,' said Rincewind. 'They always said he'd go a long way.'
'He'll go a lot further if he opens the book,' said one of the wizards, who was hastily rolling a cigarette in shaking fingers.
'Why?' said Twoflower. 'What will happen?'
The wizards looked at one another.
'It's an ancient secret, handed down from mage to mage, and we can't pass it on to knowlessmen,' said Wert.
'Oh, go on,' said Twoflower.
'Oh well, it probably doesn't matter any more. One mind can't hold all the spells. It'll break down, and leave a hole.'
'What? In his head?'
'Um. No. In the fabric of the Universe,' said Wert. 'He might think he can control it by himself, but —'
They felt the sound before they heard it. It started off in the stones as a slow vibration, then rose suddenly to a knife-edge whine that bypassed the eardrums and bored straight into the brain. It sounded like a human voice singing, or chanting, or screamfng, but there were deeper and more horrible harmonics.
The wizards went pale. Then, as one man, they turned and ran up the steps.
There were crowds outside the building. Some people were holding torches, others had stopped in the act of piling kindling around the walls. But everyone was staring up at the Tower of Art.