There are witches EVERYWHERE. Witches could be a cashier in a supermarket, a woman driving a fancy car, or even your own teacher. The only thing a witch cares about is squelching children.
She hunts and squelches as many children as she possibly can. At least one a week. The Grand High Witch hates children most of all and plans to make every single one of YOU disappear.
Only one boy and his grandmother can stop her. But if their plan fails, the Grand High Witch will frizzle them like fritters, and then what will happen?