After a moment,
"...And then, the fact that Touko Aozaki is here completely changes the line of thought
we need to follow." The sigh that followed was even gloomier than before.
In a way, her presence here was a far more important mystery than discovering who the
true culprit behind the murders was. It appeared that despite our respective silence, my
feelings were communicated quite clearly.
"It seems you've given that some though, Lady."
"Yes, of course I understand," I nodded, letting my frustration leak out in my voice.

"Was the Princess of Gold that died even the real one?"

Ever since the presence of the Grand known as Touko Aozaki was discovered, it was a
question that had been scratching incessantly at the back of my mind.
My brother pushed the question one step further.
"And on top of that, doesn't it make you wonder if one of the two Princesses is a puppet
in the first place?"
"...eh?" Gray blurted out with a stunned expression.
As if her whole world had just turned ashen, she looked between the two of us.
"...a puppet...but the Princess of Gold we saw was human..."
"Right. She couldn't have been anything but human. But the moment Touko Aozaki is
in the picture, you have to throw out all your preconceptions." Saying that, I raised two
fingers. "The services she provides for the Clock Tower are varied, but there are two
that she's famous for."

The Case Files of Lord El-Melloi II, Volume 2, Chapter 4