Hint :
Tip: 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.