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Find the ancient King Albert's crown

The Crown is in a wall locker, so first of all you need to find the key to open it.  The key's location is revealed in the note written by the slave locked in the top floor secret room.  You can get to the slave's room by going North from the stairs, through the door to the East, then left round the corner.  Head East along the North wall and frob the second tomb to reveal a hidden entrance. Crawl through and pick open the metal door ahead.

To get the key, go through the door to the South of the top floor stair area, and then through the second door on the right. The key is tucked behind the third tomb on the left.

Go back to the stairs area,  but this time go out through the North door, then through the door on the left. Go through the door facing you, and turn right (North). Go round the corner (West) and in through the door on the left. The Crown locker is in the far wall.