I FOUND MY ROOM AND GOT OUT. NOW WHAT?
Are you getting a little hungry maybe?
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Follow the baize door in the back hall behind the big staircase to go down to the kitchen.
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Have a warm and informative chat with the chef. Make sure his introductory "card" appears and you have a memory of him in your inventory before you leave.
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Keep exploring the various rooms. Jackson talked about more guests?
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Enter the billiard room (door on your left as you face the big staircase).
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Talk to Calvin, then go to see who's at the door when the doorbell rings.