Fridays with the Wizards: Castle Glower Series, Book 4

Princess Celie and her companions have made it home safely from the Glorious Arkower, and everything is back to normal now that the Eye of the Castle is where it belongs. With more magical griffins to care for, Celie, Lilah, and Rolf have their hands full. But when the dangerous ancient 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 hiding - deep within the secret passageways behind the walls of their beloved Castle. With danger lurking behind every tapestry and under every trap door, Celie must find the wizard and save her family.