So I'm in the party. I've killed a few guards here and there, but no-one has been alerted or witnessed this. Some rooms, when I enter them, I hear a singular voice yell "help!" with no subtitles. This has happened in rooms with nobody in them and rooms with people in them. Is...is there someone crying for help somewhere?
I thought maybe it could be coming through those air vents, but all the ones I could find with rat holes just led to rooms I've already been in.
I also used the dark vision here and there but didn't see anything immediately suspicious.

Rooms I can remember off the top of my head it has happened in:
The separate Lady Boyle room
Purple Lady Boyle room
That main hall with the electric fence
The trophy room with the fireplace

Did you get spotted by a maid? If they see you carrying a body, choking someone or using magic, they freak and stay that way, usually cowering somewhere, for the remainder of the mission.

There was something in the background noise that I continually mistook for 'Help!' when I was creeping around upstairs on my last visit to Lady Boyle's. I think its just someone shouting at the party that sounds a lot like help, if I know the noise you're talking about.

But if they catch you they run around cowering. This yelling started right from the start when I entered the building. No-on inside would have known what I was doing, yet the "help!" was there. But perhaps it was just someone shouting at the party. I'll see what my no kill run brings uo