A cool scary mission, but sadly I had the same problem as others here in that the door to Olivia's room was not open. I got stuck completely until I checked this thread and noclipped through the door, so you need to fix that fast! I had a similar problem with the closet on the ground floor, the skeleton blocked the door and it couldn't be opened. It worked after a restart, but you might take the chance to fix that too. Last not least it fealt strange not having lockpicks and the doors being unlocked by the ghost instead! Why not make all doors without keys pickable? I don't think the story would change much and I wouldn't feel like the stupiest thief ever, having lost his lockpicks :)!