Fathom, Why am I pursuing her? [SPOILER?]

I am walking around Riften tonight and all of the sudden I hear an ethereal sounding voice say "Why, why do you pursue me?". I have subtitles on so I can attribute the voice to Fathom. I started hearing this voice when I was on my way to the lake to look for the Quill of Gemination. Any idea what this is all about? I looked it up on the tubes but I couldn't find anything.