The Sweetness at the Bottom of the Pie, by Alan Bradley

Eleven year old Flavia de Luce is a beginning chemist with a
particular fondness for poisons. Her family seems pretty normal:
two older sisters, one book obsessed and other obsessed with
herself, one dead mother and a kind if absent-minded father.
But when a dead bird turns up on their doorstep with a postage
stamp attached to its beak and shortly later Flavia discovers a
dead man in her garden, it becomes clear that her family has
dark secrets Flavia had no idea existed.

This mystery completely sucked me in. The protagonist is clever
and yet still seems like a child, not an adult in a child's body
which is what seems to happen a lot in mystery's where the
investigator is a young person. I liked the writing style and the
voice of Flavia rang very true to a intelligent child's way of
seeing the world as neither an adult sees it or a child who
doesn't pay as close attention to their world.
5 stars,
Emme