I Am Half-Sick of Shadows by Alan Bradley

When a film crew settles in at the Buckshaw estate before the Christmas holidays, it's all lights, camera and murderous action. So the precocious Flavia de Luce focuses her attention on the corpse at hand, taking time out from chemistry experiments and an attempt to capture Father Christmas to track down the killer. The fourth in Alan Bradley's popular de Luce series.

I am Half-sick of Shadows, Alan Bradley, $30.