Goodreads
Goodreads asked Andrew Wallace:

Where did you get the idea for your most recent book?

Andrew Wallace It started as a niggling worry that if the human population keeps growing and building there will eventually be just one great house covering the entire planet. I wondered how such a feat could be achieved, which led to the inventions which became the system underlying my eerie future society.
 
Eventually the setting evolved into a city instead of an Earth-smothering construction, although it is a city no one can leave. A beautiful, terrifying place, it is so technologically advanced that any kind of government is impossible.
 
Into this lethal, beguiling environment steps bright but naïve Charity Freestone, who somehow survives everything the city hurls at her. How she does so and what exactly the problem is with everything are questions that determine the rest of the story.
 
My blog on Goodreads goes into more detail. I’d love to know what you think.

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