Chester, high off the success of his first book, decides he has no need for his illustrator, until she calls an open audition for a new, less self-absorbed feline to take Chester's place in the book.
Seven-year-old Grace gets so involved in working with Grace W. and Grace F. on a school project that she fails to understand why she and her best friend, Mimi, are drifting apart.
Jack and Annie travel to Vienna, Austria, in 1762, where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius' life.
Nyroc, son of the evil Kludd and Nyra, is forced to fulfill his dead father's destiny and oppress all of owldom, but when doubt grows in Nyroc's heart he must make an ultimate decision between good and evil.