England, 1950. At Buckshaw, the crumbling country seat of the de Luce family, very-nearly-eleven-year-old Flavia is plotting revenge on her older sisters. Then a dead bird is left on the doorstep, which has an extraordinary effect on Flavia's eccentric father, and a body is found in the garden. As the police descend on Buckshaw, Flavia decides to do some investigating of her own..