Slenderman, having been reading his first proxy's file in hope of finding their whereabouts, had forgotten to hide it away before leaving the room, and when he sent his current proxy Masky upstairs to grab a file for their newest mission he ended up seeing it. Curiosity pulled, Masky asked about the proxy he never knew of, only to learn that there are somethings that should be left in the past. Or should it? Meanwhile Zalgo has secret he tries desperately to hide from the outside world, and especially from the members of the Slender Mansion. What happened to Slenderman's first proxy? Where are they? What is Zalgo so determined to hide the he is willing to risk everything to keep it from Slenderman. And will the members of the Slender Mansion be able to solve the mystery that surrounds the past of their leader before someone gets hurt?