Find this sitting room, which is left of the main staircase. Shoot the picture of Hitler:
This reveals a hidden button:
Shoot the button:
This causes a door on the left side of the staircase to open:
Go through, into a secret room:
Find this sitting area, which is located near the exit of the level:
Examine the set of fire irons.
USE the leftmost fire iron (notice: you don't see the usual graphic that shows you can use something):
This makes the fireplace move aside, revealing a secret chamber:
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