I love how it's starting to get connected... We'll be able to finally know what's this Anastasia is about, and what it is exactly. I am starting to get really excited about this case solving phase. And I read about some of the comments here that it's possible that the blueprint is in the room itself which I totally agree. Just like on that one manhwa I read, the Nothernblade Sect (can't remember the exact name) where the whole secret of their sect was planted in their territory base and can be seen at the top of the tower that can oversee everything at the ground where sun helps it shows the letters in it's shadow. So, the possibility that the blueprint is in that room itself is plausible. It can be on the floor or the walls that's why it's never been occupied, and maybe the letters will appear in the dark once the lights are out? Since it shows how its light never gone out. Anyway, let me marinate this again for a while.