As Vijay Fafat points out, the eponymous heroine of this series of humorous, fantasy mysteries has a daughter who is a math prodigy. Among other things, in this novel she finds a counterexample to Fermat's Last Theorem, concludes that there are 17 more odd numbers than even, and that there is a largest number. The clever 9 year old seems at first worried that people are angry at her (she was not supposed to find a solution satisfying the statement of Fermat's Last Theorem  the teacher had only put it on the board to explain that there was no solution), and then a bit annoyed at the mathematicians who come to seek insight from the young genius ("They're all a bit slow...some of them can barely count.")
