1. Schalterrätsel:
Pull on the left candle, then the right candle, and finally the middle candle
Allerdings muss der Ghoul sofort nach dem Ende der Zwischensequenz eliminiert werden!
2. Schalterrätsel:
Pull on the mechanisms until all three are lit up, then pull on the middle lever again to reveal a hidden door behind a bookcase on the lower level.
Aber:
As a side note, if you don't want to do the candle puzzle, you can also access this hiddden door by activating a particular book on one of the bookshelves.