Class 6's teacher is a witch. That's bad. The dancing skeletons and pterodactyls they can see in her eyes are worse. And nobody likes the snake in her desk. But worst of all are the witch-nits.

Rodney catches them first. It's not long before the whole class is scratching. Then strange things start happening to them. The green glowing toenails. The antennae that pick up digital radio. And whatever it is that Rodney's turning into...

Is there any cure for the nits of doom?

Sally Prue isn't sure where she was born, but from the time she was adopted as a baby she was brought up in Hertfordshire. Sally and her husband Roger have two grown-up daughters: Sophia and Rosalind.

When Sally is not writing books she's often reading them, or writing e-mails. She also has a house and garden that decays just slightly faster than she can do anything about it. She likes walking, and birds and other animals and plants. She is really interested in frogs, art, making things, music, people, ideas, fabrics. She has a set of Northumbrian bagpipes, but she doesn't play them very often at the moment. Which is probably a good thing.