What are the two main settings in the novel, First Among Sequels?

There are two predominant settings in the book, the real world and the BookWorld. Thursday is an outlander, a real person, but she works as a Jurisfiction agent in the BookWorld. BookWorld is a massive space in which books float in a vacuum, held together by gravity according to genre, like little solar systems. Every book that has been written, whether good or bad, published or forgotten, exists like a planet in the BookWorld. Thursday spends her time jumping from one book another.

The other setting is the "real world." The real world represents modern day, expect that there are more technological advances. There are also comic elements to the setting, such as the existence of a stupidity surplus under the power of the Commonsense party, the decline in reading, and the existence of strange and magical creatures that have to be caught and contained by special agents. There is also a ban on cheese, making the illegal buying and selling of cheese products a criminal offense, and a very lucrative venture. Most of the cheese comes from across the border in Wales.