Look into mouse hole from afar.

You gaze into the mouse hole, in which you see an Improbably Coloured House-Mouse, who is trying to invite you in for mid morning tea. Inside the mouse-house, you notice an picture of her and her mouse-spouse, and an Iron Key.

Examine Box

Upon closer inspection, you find that the box is held shut with an Iron Lock, indicating that there is most likely something of value inside. There is a small mouse hole in the corner of the room.

Start

You are Englishman, stalwart defender of all that is upper brow and posh. You have awoken from a week long Opium bender, as is your custom of a Tuesday, to find yourself once again in a place you don't recognise, lacking in the most basic of hygiene disciplines and sporting mutton chops that put Honest Abe to shame, whoever he is. You are in a room with a door, a wooden box, and the crushing depression of being an industrial revolution stereotype. From the other side of the door can be heard sounds that suggest a jumping good time.