I Know Someone by XScout - 10K
Summary: A serial killer sends notes to Scully, describing his latest victim.

I Know Someone II: Where Are You? by XScout - 12K
Summary: Captivity from someone's point of view.

I'lll Be Seeing You by Fox's Gal - 273K
Summary: Agent Scully receives letters from a psychopath regarding AgentMulder.

Not Without Permission by Fox's Gal & XScout - 126K
Summary: Held captive by a madman, Mulder must stay alive long enough for Scully to find him. He may not have a choice.