This quote is from the Thursday Next series of novels by Jasper Fforde. It's best if I let him explain:
"They are a series of books based upon the notion that what we read in books is just a small part of a larger BookWorld that exists behind the page. A fantastical place populated by off-duty and sometimes mischievous bookpeople from the Classics to Fanfiction, and ruled over by the wheezing bureaucracy known as The council of Genres. It is their task to maintain the pageant and integrity of the books within their charge, and these efforts are sometimes thwarted by the very evildoers and bizarre plot devices that give the Bookworld its appeal. Aided in this endeavour but sometimes disagreeing with them are Jurisfiction, the policing agency within Fiction. The adventures follow one of their operatives: A woman from the Realworld named Thursday Next, whose reality-based credentials bring a dimension of independent thought to the proceedings, something that is often absent in the mostly predetermined Bookworld."