This is a tough book to describe clearly.
Tuesday Next is the protagonist in a series of books set in a parallel universe. In this universe, BookWorld is a place where characters can move among books by bookjumping. Although Tuesday is a real person, she is also a training agent for BookWorld's police, Jurisfiction.
While being pursued by an enemy, Tuesday hides in an unpublished novel Caversham Heights in the Well of Lost Plots. The Well consists of 26 subbasements of unpublished novels beneath the Great Library the home of all published fiction.
Got it?
There's also a murderer on the loose. Thursday may be his target.
It's a fun and fascinating read, but the literary references can be confusing if you're unfamiliar with the plots and characters of the classics including Uriah Heep, Heathcliff, Miss Havisham. (I knew enough to get by.) This is also the third book in the series, which I didn't realize when I picked it up at a library sale. I prefer to start with the first.
An important part of the plot concerns a new operating system called UltraWord. Tuesday argues against its adoption. "I'm talking about the wholesale destruction of everything that is intuitive in writing--to be replaced by the formulaic." An omen about AI?