MISSION 4: The Clockwork MansionOnce you arrive at the actual Mansion, go through the first door and look up, shoot one of the left top windows and reach up. Follow the narrow path until you reach some open windows in the floor.
In the next room behind some windows are 2 guards. Be careful and don't get spotted. Take your time and peak out to take them out one by one. For the Silence achievement / trophy you can't get spotted at any point.
Next up go straight and turn right at the clockwork robot. Follow the balcony in the next room to the right and reach to the lower platform to the right. Crawl through the hatch and take the elevator to the top floor.
Be careful here again and you won't have much trouble. A Clockwork robot is patroling on the right, so go left in the circular room and look for the perfect moment to take yout Jindosh before he notices you.