Help with Dishonored needed.

I have finally found time to play Dishonored. No problems with first 3 missions but a bit of a puzzle with the night before Lady Boyle's Last Party. I have talked to Cecilia in the pub. She offered me a key to abbandoned house which contains Bone Charm but, for the life of me, I can't find doors which this key would open! There are several doors in a walls of the buildings opposite to the pub (including one on the first floor) but they all appear blocked!?

Never mind. Found them