Well of Witches

From the Publisher:

J. A. White’s The Thickety: Well of Witches is an epic quest into an enchanted kingdom with new kinds of magic, an old enemy, and only one way out. Fans of Neil Gaiman will love this third novel in the spectacular and twisty fantasy series that has readers and reviewers raving.

Kara and Taff know that only Grace Stone has the power to reverse her Last Spell on their father, and that in order to save him, they have to rescue their foe from the Well of Witches first. Forgiving Grace should be the hardest part of their journey . . . but soon the children are confronted by creatures called the Faceless, mysteries as old as magic, and an ancient secret that threatens their very lives. Back in the World, a war against magic is brewing that endangers everyone they care about. Can Kara and Taff find Grace and make it back to their father in time?