The Meaning of the Attic Key
The HousemaidThis thread traces how a small key shifts from a household object into an instrument of confinement, escape, and reversal.
increasing
Bearing strength in each event
decreasing
The Key Requested

Seeking Control of Her Door
An exterior lock
Millie asks Nina for a key because the attic bedroom locks from the outside. Nina jokes about her concern, then promises to find one.
Safety remains uncertain
The key request shows Millie trying to secure privacy in a room that makes escape difficult. At this stage, she does not know who else might hold access.
A Key Finally Given

A Promise Fulfilled
Permission in appearance
Nina gives Millie a key to the room after Millie mentions the painted-shut window. Millie pockets it, believing it might help protect her belongings.
A quiet preparation
The key seems like an ordinary accommodation. Later, it becomes essential to Millie's ability to lock Andrew inside the room he used against her.
The Key in Millie's Pocket

A Hidden Resource
Captivity from within
Andrew locks Millie in the attic and controls her release. Millie remembers that Nina gave her a key, though her immediate choices are constrained by the locked door and lack of water.
Power held in reserve
The key is not enough by itself to defeat Andrew. It matters because it can be combined with timing, observation, and a moment when he is vulnerable.
The Lock Reversed

A Change of Sides
Escape from the room
Millie leaves the attic and uses Nina's key to lock the door behind her. Andrew is left on the inside, demanding to be released.
An object becomes leverage
The same key that marked Millie's vulnerability now gives her control over Andrew's movement. Its meaning changes because the person holding it has changed.
Nina Enters the Attic

Returning to the Site
The key used again
Nina unlocks the attic room and enters, believing Millie is trapped inside. Instead, she finds Andrew dead and Millie outside the immediate danger.
Access and revelation
The key carries Nina back to the place of her own captivity, but this time she enters freely. The room's history is finally visible to both women at once.
Millie's first day in the attic room
About a week after Millie starts work
During Andrew's first punishment of Millie
After Millie sprays Andrew
When Nina returns to the Winchester home