As Chimney Sweepers Come to Dust (Flavia de Luce #7) by Alan Bradley

Hard on the heels of the return of her mother’s body from the frozen reaches of the Himalayas, Flavia, for her indiscretions, is banished from her home at Buckshaw and shipped across the ocean to Miss Bodycote’s Female Academy in Toronto, her mother’s alma mater, there to be inducted into a mysterious organization known as the Nide.