dishonored lady boyle's last party third floor?

Answer 1

In the upper level of the Boyle Mansion, two bedrooms are on one side of the great hall, and one bedroom is on the other side. Both of the two bedrooms on the same side of the hall have a bellpull by the bed. Use either bellpull to open a hatch in the bedroom ceiling. In the attic is a chest with ingots and the Boyle Cameo.