The book follows three main characters, Miss Celestial "Celeste" Temple, Cardinal Chang, and Captain-Surgeon Abelard Svenson, as they attempt to thwart the mysterious plot of a sinister cabal. There are ten chapters in the book, and each is from the point of view of one of the main characters. Chang and Svenson get three chapters each and Miss Temple gets four (the novel both starts and ends from her point of view).
