Thrice the Brinded Cat Hath Mew'd (Flavia de Luce #8) by Alan Bradley

In spite of being ejected from Miss Bodycote’s Female Academy in Canada, twelve-year-old Flavia de Luce is excited to be sailing home to England. But instead of a joyous homecoming, she is greeted on the docks with unfortunate news: Her father has fallen ill, and a hospital visit will have to wait while he rests. But with Flavia’s blasted sisters and insufferable cousin underfoot, Buckshaw now seems both too empty—and not empty enough.