Series: Flavia de Luce #4
This is an interesting place to end up near Halloween since this story takes place at Christmas. Flavia has a surprise planned for Father Christmas in order to prove his existence despite her sisters' insistence to the contrary. It's a very Flavia plan, of course. There's also a film crew at Buckshaw and a murder happens, naturally. And Flavia just can't stay out of it.
I'm using my second author wildcard in order to count this for the Shifters square for the 2018 Halloween Bingo.