The Sweetness At the Bottom of the Pie by Alan Bradley
The first in the Flavia De Luce Mystery series this is a treat for cozy mystery readers. Flavia is an aspiring chemist, with a passion for poison, living in a once grand mansion in the British countryside in 1950.
Her world becomes a bit more interesting when a dead bird is found on the porch with a stamp on his beak and a few hours later a man dies in a cucumber patch. Horrified and delighted Flavia sets out to solve the murder.