Belinda's unusual grandmother, with her unusual cat, Senna, is looking after Belinda while her parents are away. Belinda is thrilled because unusual things always happen when grandmother comes to visit... And this visit is no exception, first the girls learn of the missing Will that will save old Miss Higgins, then the petrified gryphon on Miss Higgins' roof accidentally gets woken. If a hungry, angry gryphon wasn't bad enough, Belinda and her friends learn that they must find the gryphon's missing ankh, because it might know the location of the Will, and it won't rest till the ankh is found...