Sixteen-year-old Petronella is once more thrown into adventure as she uncovers a plot to assassinate King Edward and a Russian archduke.
With the help of the dashing and swoon-worthy Sir James Sinclair, her best friend Lady Jane Sinclair, and her beloved Uncle Augustus T. Percival, Petronella saves several more people from a certain and horrible death devised by the evil Rasputin.
Matters are complicated when Uncle Augustus falls in love with a Russian countess, the Royal Entomological Society holds an international convention to which Uncle insists on going, James becomes unwillingly engaged, and Petronella learns to drive a motorcar.
The Entomological Tales of August T. Percival, bk. 2