Hogfather - Tooth Fairy

'Er... hello?'

The voice came from the corridor. They worked their way round to the next room. There, sitting on the floor and tied to the leg of a white display case, was Violet. She looked up in apprehension, and then in bewilderment, and finally in growing recognition.

'Aren't you-?'

'Yes, yes, we see each other sometimes in Biers, and when you came for Twyla's last tooth you were so shocked that I could see you I had to give you a drink to get your nerves back,' said Susan, fumbling with the ropes. 'I don't think we've got a lot of time.’

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Hogfather - p283