Following the dramatic events at the conclusion of 'The Dead in their Vaulted Arches' and the shocking revelations about her mother, Flavia de Luce finds herself expelled from the familiar confines of Bishop's Lacey and her beloved family home, Buckshaw, and 'packed off', as she puts it, to Miss Bodycote's Female Academy in Canada. With its forbidding headmistress and bizarre rules, adapting to Miss Bodycote's is quite a challenge. But Flavia is soon on familiar ground, when, on her first night, a mummified body is dislodged from a chimney, and she is presented with a gruesome puzzle to solve.