Restricted Access to Great Hall is a written note found in Dishonored 2.
To all of you working tonight, Mister Stilton asked me to restrict access to the Great Hall, after the arrival of the Duke and his other guests. They'll have their own people with them tonight for security.
I'll be in the Dining Room if I'm needed.
- Captain Cordero
The note can be found on the door leading to the Great Hall in Stilton's Manor, in the past, during the mission A Crack in the Slab.