Just blindly guessing:
 There are some extra pages in the book, who originated from the Emerald Tablets or the Bible
         -Gutenberg

 Maybe also missing from the original
         -Jo Nesbø

Or maybe:
 Alice's Adventures in Wonderland
 The Adventures of Sherlock Holmes
 The Three Musketeers
 The Scarlet Letter
 Moby-Dick
 The Strange Case of Dr. Jekyll and Mr. Hyde
 The Adventures of Tom Sawyer
 Life on the Mississippi
 The Count of Monte Cristo
 The Wonderful Wizard of Oz
 The Hound of the Baskervilles
   -The Time Machine

was major world events, book releases, and such in my life, along a test-group`s lives, and presented history part of an over-ordered script where the story contained for example book releases, which than in turn was side-released in full version in addition to the main story?
and am i than living out part of the story that is to be written as the next season, inside a world of this presented release-structure, to let the narrator get inspiration for the continuation and see how an actual human test-subject would behave in such a world?