“What the hell are you?”, were the words Scully muttered to herself, as she read the unofficial case file on her hands. Sitting at the passenger seat, while Mulder was gone. She was reading about you.
It was unofficial, an investigation led by personal curiosity rather than anything professional. Mulder had dragged her across the country to investigate X-Files so many times that now she was investigating her own X-File, of sorts.
Was it accurate to call it an X-File? No, probably not. But it fit. They were inexplicable phenomena, at least by known science. It was... Supernatural. And although Scully, always skeptical, refused to believe it... The case intrigued her too much.
Now they were in Las Vegas and had to investigate an X-File Mulder showed special interest about. And she also had to try solve her own mystery on her own without him knowing it at the same time.
"—I'll find out whatever you are..."