As chimney sweepers come to dust by Alan Bradley

  Another really fun book in the Flavia de Luce series.  I LOVE these books.  This time Flavia has been sent to a school, Miss Bodycote's Female Academy in Toronto, Canada where, as usual, she stumbles upon a murder.  Now it will take her incredible skill as a detective (of course involving chemistry) to  solve the mystery.  Highly recommend.