You exit this room back to where the computer is located - use the door at far end of the hallway.
Then you'll be in the hallway and see a sideroom where the computer is located. Do not enter here.
Go to the lower screen on that hallway.
You will then be in the hallway where the ladies where imprisoned.
Go down the hallway and see the ladder to the back room, the hallway with the storage cabinet and the door to the area that will lead to the cellar of the house.
