'And this wall,' said the king, 'and the floor. Someone's been counting. Every ten have been crossed through, you see. Someone's been counting things. Lots of things.' He stood back.

'What things?' said Dil, looking behind him.

'Very strange,' said the king. He leaned forward. 'You can barely make out the inscriptions underneath.'

'Can you read it, king?' said Gern, showing what Dil considered to be unnecessary enthusiasm.

'No. It's one of the really ancient dialects. Can't make out a blessed hieroglyph,' said Teppicymon. 'I shouldn't think there's a single person alive today who can read it.'

phinx gave him a stony look, and then showed its fangs.

'Oh no,' it said. 'You don't catch me out like that. You think I'm stupid? You've got to tell me the answer.'

'Oh, blow,' said Teppic.

'Thought you had me there, didn't you?' said the Sphinx.

'Sorry.'

'You thought you could get me all confused, did you?'

The Sphinx grinned.

'It was worth a try,' said Teppic.

'Can't blame you. So what's the answer, then?'

Teppic scratched his nose.

'Haven't a clue,' he said. 'Unless, and this is a shot in the dark, you understand, it's: A Man.'

The Sphinx glared at him.

'You've been here before, haven't you?' it said accusingly.

'No.'

'Then someone's been talking, right?'

'Who could have talked? Has anyone ever guessed the riddle?' said Teppic.

'No!'

'Well, then. They couldn't have talked, could they?'

The Sphinx's claws scrabbled irritably on its rock.

'I suppose you'd better move along, then,' it grumbled.

'Thank you,' said Teppic.

'I'd be grateful if you didn't tell anyone, please,' added the Sphinx, coldly. 'I wouldn't like to spoil it for other people.'

Teppic scrambled up a rock and on to You Bastard.

'Don't you worry about that,' he said, spurring the camel onwards. He couldn't help noticing the way the Sphinx was moving its lips silently, as though trying to work something out.

You Bastard had gone only twenty yards or so before an enraged bellow erupted behind him. For once he forgot the etiquette that says a camel must be hit with a stick before it does anything. All four feet hit the sand and pushed.