A good approach to playing the game: Flip all the marker
switches up on the island. Then go up to the library, click
the map of the island, and start the tower rotation by
clicking and holding down the flashing circle, which
indicates that a warp book is there. After the tower
rotates towards the object, you can find hints behind the
bookcase. Leave the map and open the bookcase by clicking
the picture next to it. You'll see some stairs. Climb them
to go to the top of the tower. There you'll see two ladders.
Climb the key ladder to get more clues.