Does one need four fully-grown foxgloves for decorating a dinner table for six guests? Or is it six foxgloves to kill four fully-grown guests?

Sophronia's first year at school has certainly been rousing. First, her finishing school is training her to be a spy (Won't Mumsy be surprised!). Secondly, she gets mixed up in an intrigue over a stolen device and has a cheese pie thrown at her. Now, as Sophronia sneaks around the dirigible school, eavesdropping on the teachers' quarters and making clandestine climbs to the ship's boiler room, she learns that there may be more to a school trip to London than at first appears . . .

Vampires, werewolves and humans are all after the prototype Sophronia recovered in Etiquette & Espionage, which has the potential to alter human and supernatural travel. Sophronia must try to uncover who is behind a dangerous plot to control the prototype . . . as well as survive the London season with a full dance card.