A young girl with a fascination for the macabre turns detective in her grandparents' creepy manor house.

What colour is a dead person’s face? Greta Sullivan had been wondering about it for a while. In horror stories it was white or yellow, but that morning an article had mentioned a strangled guy found “with a cyanotic face” and Greta knew that cyanotic meant blue. And so? Gorse Manor, her grandparents’ house, only fuels her doubts...

• A broken window, the family jewels stolen and a ghost who misses an appointment…

• For eight-year-old Greta, curious and resourceful, it’s the beginning of a dream: let the investigation start!