Thanks for the suggestion; it sounds like fun and I just ordered a copy.
It is fun. I am about half way through the book and enjoying every minute of it. I have to do it on quiet weekend days when I can totally concentrate. You have three stories going on (the story written in the “book”, the story of the guy and girl who communicate by writing in the margins, and the “real story” which the author hid inside the “Book story” which you have to figure out)...... all intertwining in J.J. Abrams’ marvelous fantasy fashion.
First thing I did though was to stick a little sticky-note on each insert to note what page of the book it was originally inserted into. That way, when they fall out, as they tend to do, you will know where they belong in the timeline. Then I keep a little notebook to remind me of the stuff I figure out, for instance (hint) there is a cipher code somewhere in the footnotes of each chapter that provide a big clues along the way. The first one and how it is solved, is pointed out by the girl leaving notes in the margin.
Just go slow and enjoy it!