In her alternate England of 1851, while taking her friend Sidheag by train to her werewolf pack in Scotland, fifteen-year-old Sophronia uncovers a plot that threatens to dissolve all of London into chaos and must decide where her loyalties lie once and for all.

In her alternate England of 1851, fifteen-year-old Sophronia tries to uncover who is behind a plot to control a prototype that has the potential to alter human and supernatural travel, and to learn what role Mademoiselle Geraldine's academy for young spies plays in the affair.

In an alternate England of 1851, spirited fourteen-year-old Sophronia is enrolled in a finishing school where, she is surprised to learn, lessons include not only the fine arts of dance, dress, and etiquette, but also diversion, deceit, and espionage.