Banished from her home at Buckshaw for her recent indiscretions, Flavia is 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. No sooner does she arrive, however, than a body comes crashing down out of the chimney and into her room, setting off a series of investigations into mysterious disappearances of girls from the school.