Title: The Doomspell
Author: Cliff McNish
In a blaze of light, rush of wind, and scrabble of claws, Rachel and her younger brother are ripped through the wall
and hurtled on to another world. Like thousands of children before them, they have been snatched away by the Witch. But this
time the Witch has met her match. Rachel discovers that she has extraordinary gifts: she can transform herself into a speck
of dust, or fly on an owl's back, just as the Witch can. The Witch is excited - she has found someone she can use for her
own evil purposes. But for the Witch's victims, Rachel is their only hope.