OK, I am in the mansion and have made it through the house and gotten the safe in the basement open, (I got the combination) but there is a DOOR in that same basement with the safe that I seem to be missing a key to! I have the master key and the key to the control room. Where is the key to this door?
Also, I noticed in the control room where you shut three cameras off, a ladder, but apparently the hatch it leads up to is locked from the outside, as I can't find a way to get it open.
So what do I need to do next? I have read through all the posts about this mission, but can't seem to find out what to do.