HOW TO get to the boyle mansion attic dishonored?

Answer 1

In the upper level, 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.