It all worked out better than I could have possibly imagined.
Just as I determined it would be necessary for me to interact with Christine directly, she set about devising a method to communicate with the Opera Ghost. As a musician, I admired her sense of timing immensely. And, as a man, I confess I was quite shaken by the notion that any woman would expend so much effort to reach me.
Christine was so very persistent. She continued her talks with Joseph Buquet, but her questions no longer pertained to my deeds or characteristics. Now, her focus shifted to pinning down the particulars of Buquet's part in our encounters. Where was he when he last caught sight of my shadow? What was he doing at the precise moment I appeared? At which point did I vanish and in what direction did I do so?
There was a mirror in one of the dressing rooms that could function as an entrance to the cellars. I knew of it because I had installed it myself, in the initial phases of the opera house's construction. One could never have too many escape routes, you see. Perplexed by Christine's pursuit, I began to make arrangements to transform the mirror-door into a mirror-window.
I wanted to see her when I spoke to her. I needed to observe her reaction, to glean clarification from it, but it was best for everyone involved that I remained invisible.
I built the association swiftly. I brought mirrors up from storage and planted them in locations I knew Buquet was bound to pass. Then, at the right moment, I permitted him to catch a glimpse of me. Or, most often, I provided some dark projection that he could easily embellish into being me.
Buquet spun his tales. The details trickled down to Christine. It did not take long for her to notice the pattern. She started to seek out mirrors in the building, lingering by them as the other performers departed for home and staring intently at her reflection for whole minutes at a time.
I finished my work on the mirror-window and waited for her to stumble upon the correct entry point in a grueling state of anticipation. I knew what I planned to say to her. But what did she want with me?