The attic where you got a book in exchange for a photo, go to the left then up and interact with the bookshelf in the top left on it's empty right side.
I cant find the attic i got the Photo from the Ghost Girl i helped and she Took a Picture of me and another Pictures i rember taking but i dont rember where i have it
Attic is through the top right door from the main hall where the stalkers are, the rooms where you found the camera and Unknown's hallway are in the same path but you ignore both and go upstairs again to get to the attic, in the attic you need to reach the top left section for the bookshelf.
