Dreams Of Shattered Glass

During her summer in Paris Thea decides go spelunking in the catacombs just for the fun of it, something she has done countless times before. While aimlessly wondering through the labyrinth she stumbles upon a well sized antechamber that has nothing but a singular item in the center; a large rectangular object whith a drop cloth thrown over it.

She ripps the cloth off and unveils the most magnificent mirror she has ever seen, the edges overflowing with intricate gold scrollwork and crystal cut glass. Thea steps back to be able to more fully appreciate what's in front of her, but all to quickly is walking back towards the mirror and before she realizes, through it.

Now a unique struggle has occurred for her. By day Thea is trapped inside her own body, conscious, but forced to follow Phantom of the Opera to a T with absolutely no altercations. But at night, she is once more allowed to rule her body and do as she pleases.

What sort of decisions will Thea make and how will they effect the original storyline? What will happen when the original story ends? Will she be back in the world she knows? Or will she be stuck in the world of opera houses and mirrors?
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*Warning*
I take a long time to update, so read at the risk of not getting frequent updates.