Jeremy's Study is located on the 1st Floor through the locked door in the Smoking Room. The key to this door can be found in Guest Room #3 on the 2nd Floor. Searching the shelf in the corner, you will find a Record (Camille Saint-Saëns' Danse Macabre aka The Dance of Death) and a Book (Report from Captain J.W. Norton). Mounted on the wall is a coat of arms that appears to be missing a sword. Placing the Old Cavalry Sabre into the coat of arms will trigger the desk in the middle of the room to slide over, revealing the secret entrance to the Underground Bridge and remaining underground sections.
Note: If you've already broken the Old Cavalry Sabre, you will need to place both the handle and the broken blade piece into the coat of arms. This will still activate the secret underground entrance.
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