Princess Celie must make use of the secret passageways of her shapeshifting home and defeat the rogue wizard to save the kingdom ... The fourth book in the New York Times bestselling series

Princess Celie and her companions have made it safely home from the Glorious Arkower, and now that the Eye of the Castle is where it belongs, everything is back to normal. With more magical griffins to care for, Celie, Lilah and Rolf have their hands full. But when the ancient and dangerous wizard Arkwright escapes the dungeon and goes missing within the Castle, no one can rest until he is found. Only Celie knows where he is most likely to be hiding ... With danger lurking behind every tapestry and under every trapdoor, Celie must find the wizard and save her family. Readers will be swept away by another charming magical adventure featuring Princess Celie and her very special castle.

"Castle Glower is the true star of this charming story of court intrigue and magic. A satisfying mix of Hogwarts and Howl's Moving Castle, Castle Glower helps its true citizens, but never at the expense of plot or character development ... Adventure stories fans will enjoy this as much as children who wear their wizard cloaks proudly" - Praise for Tuesdays at the Castle, School Library Journal

"A sweet, funny, sincere story in which siblings work together" - Praise for Wednesdays in the Tower, Kirkus

"A thoroughly satisfying and original tale" - Praise for Tuesdays at the Castle, Teach Primary

"There is plenty of intrigue and a dash of magic in this unusual, engaging story with plenty of breathtaking moments" - Praise for Tuesdays at the Castle, Primary Times

"An enjoyable adventure story set in a magical world ... The action is fast-paced and exciting, gathering momentum as the plot unfolds" - Praise for Tuesdays at the Castle, Books for Keeps