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You think about this and that as you walk down the hallway. Near the end is Gar-Gar Non's office . . . actually it's probably more of den. You don't notice that someone you were just thinking about is hiding behind the chair.
  1. Get a closer look at those old crumbly old books on the bottom shelf.
  2. Push the chair up to the bookshelf so you can reach those map-looking things.
  3. Go examine that blank wall, it feels like there might be a puzzle to solve.