Norah

Walkthrough
To get inside the hospital, ask the employee behind the desk, then take control of Aiden to hit the elevator switch after distracting the guard by interacting with the electricity box and the various objects around him. To get past the next door, mess with the various objects in the mess hall to make a guard come to check out the area, who you can then take control of and open the door using his keycard. Hit the cameras in the hall, and make sure to visit room 38 for a Blue orb and massively creepy humming man. Norah is in room 43. I won't ruin this scene, as it's pretty good. The final decision is yours, and will award you a trophy depending on your choice at the end of the game.

Chronology
This scene is followed In-Game Order by Briefing and is preceded by Old Friends. It is followed chronologically by Briefing and preceded by Old Friends.