lordship . . . that is, her ladyship's father . . . he required to have his back scrubbed,' said Willikins.

'You go and help the old geyser stoke the furnace,' said Vimes firmly.

Left alone, he struggled out of his breastplate and threw it in the corner. The chainmail shirt followed it, and the helmet, and the money pouch, and various leather and cotton oddments that came between a Watchman and the world.

And then he sank, gingerly at first, into the suds.

'Try soap. Soap'11 work,' said Detritus.

'Hold still, will you?' said Carrot.

'You're twisting my head off!'

'Go on, soap him head.'

'Soap your own head!'

There was a thung noise and Cuddy's helmet came free.

Cuddy emerged, blinking, into the light. He focused on the Librarian, and growled.

'He hit me on the head!'

'Oook.'

'He says you came up through the floor,' said Carrot.

'That's no reason to hit me on the head.'

'Some of the things that come up through the floor at Unseen University don't even have a head,' said Carrot.

'Oook!'

'Or they have hundreds. Why were you digging down there?'

'We weren't digging down. We were digging up . . .'

Carrot sat and listened. He interrupted only twice.

'Shot at you?'

'Five time,' said Detritus, happily. 'Have to report damage to breastplate but not to backplate on account of fortunately my body got in way, saving valuable city property worth three dollars.'

Carrot listened some more.

'Sewers?' he said, eventually.

'It's like the whole city, underground. We saw crowns and stuff carved on the walls.'

Carrot's eyes sparkled. 'That means they must date right back to the days when we had kings! And then when we kept on rebuilding the city we forgot they were down there . . .'

'Um. That's not all that's down there,' said Cuddy. 'We . . . found something.'

'Oh?'

'Something bad.'

'You won't like it at all,' said Detritus. 'Bad, bad, bad. Even worse.'