A Witch in the Classroom!

"When I grow up, I want to be- A WITCH!" That's Abigail's dream and, to her surprise, she discovers by talking to her pet rat, Gnasher, that she CAN be a witch - NOW! But her first attempt to use her powers - by turning the class bully into a frog - stirs up a whole cauldron full of trouble when the frog escapesa And why does Abigail keep feeling that there's another witch arounda?