This is a "Flavia de Luce Novel" -- the third in a series about an 11-year-old lover of chemistry and amateur detective. I read the first (The Sweetness at the Bottom of the Pie) and liked it fine, though this will probably be the last time I seek her out.
Flavia, her obnoxious older sisters, her distant father, and her rapidly deteriorating genteel way of life are simply boring. Her adventures in crime-solving and delight at all things chemical just get old so fast. The book was a quick read, but I'll barely think about it again...there's just nothing much worth contemplating now that the last page has been read.
C+