Decline of the Old Order

The book portrays the inevitable supersession of traditional values, institutions, and classes (represented by the narrator's heritage, the Granger family, and figures like Churchill) by a new, ruthless, and modern force embodied by the 'Dimensionists' and characters like the mysterious woman.

The reference to Sardanapalus evokes the collapse of ancient civilizations, hinting at the fragility of established structures.

Churchill is depicted as an aging figure trying to hold onto relevance, symbolizing the waning power of the old political elite.

The woman explicitly frames her plot as a means to destroy Churchill and the old order of probity, echoing the fall of the Legitimists.

The narrator's aunt embodies the fading aristocracy, isolated in her immense salon, 'waiting for the deluge,' and the narrator observes the 'last of a race, of a type.'