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 steals 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...

Sophronia must rely on her training to uncover who is behind a dangerous plot and what role Mademoiselle Geraldine's plays in the affair. If only that weren't as challenging as surviving the London season with a full dance card!