The Bag of Bones — Vivian French

When the quill writes GO GO GO frantically on the wall, and the House of the Ancient Crones heaves Gracie Gillypot outside onto the path, it can mean only one thing: theres Trouble in the Five Kingdoms. This time its in the form of a beady-eyed, green-tongued witch named Truda Hangnail, who with her banished Deep Magic has vowed to succeed Queen Bluebell on the throne. Now that her horrible spell has shrunk the good witches of Wadington to the size of, well, rats, can anything stop her? Will the strengths, smarts, and charms of a spunky trueheart, a sweet-natured orphan, a scruffy prince, a substantial troll, and two squabbling bats be enough to foil her insidious plot?