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There is no wall between Hallway 4 and Hallway 2. You can move from Hallway 4 to Hallway 2 and then enter the Master Bedroom through the door. You're welcome!
But note: You can't tell that from the diagram in the Investigator book
Once you have laid out the tiles you will see there is no orange line (wall) separating the two hallway pieces; but looking at the diagram will make you go insane!