WHERE CAN I FIND THE CODE FOR THE SAFE BEHIND THE PORTRAIT?
You will not be able to get the code until near the end of the game..
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When it's time, there will be a hint about it somewhere in Bodkin Hall.
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You'll find something new in one of the main floor rooms at some point.
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A drinks cart in the drawing room will reappear. It will only do so after you have completed ALL the tasks that lead up to it.
If the drinks cart has not returned, you are still missing a task somewhere.