Hogfather - Control Children

'He's dressed like an Assassin. He's called Teatime. I think they're trying to steal something... They spent ages carting the teeth out. Little teeth everywhere... It was horrible! Thank you,' she added to the oh god, who had helped her on to her feet.

'They've piled them up in a magic circle downstairs,' said Susan.

Violet's eyes and mouth formed three Os. It was like looking at a pink bowling ball. 'What for?'

'I think they're using them to control the children. By magic.’

***

Hogfather - p285