Reaching the yard | Mission 2 - High Overseer Campbell Dishonored Guide
Last update: 11 May 2016
You can reach the yard in two ways. Variant one assumes using the door on the ground floor of the Overseer's building (the above screenshot). It is a good choice if you are pressed for quick quest completion.
Variant two Assumes going to the door at the end of the main road to the left of the Overseer's building (Back Alley - the above screenshot). I recommend using this way, because you will be able to resolve a conflict and pick some valuable loot. Be careful, however; this passage is, by default, guarded by two guards (you can go around them or eliminate them).
After you get to the new area, go straight ahead. Around there is a quarrel between guards. Since one of the guards is accompanied by an innocent person, you may show some initiative and offer your help. It's especially recommended, because you can easily sneak up to the guards from behind and eliminate them (by either killing or choking them). You will receive thanks and a combination for the safe in the nearby barracks, as a reward. Additionally, it's worthwhile to loot one of the guards for a back yard gate key. Note- Nothing bad will happen if you decide not to save the people. The combination is not required to appear in Corvo's log if you want to open the safe anyways.
You may now go ahead and collect Sokolov's health elixir. Be careful, because the nearby alley is patrolled by an additional guard. You should also look around for the hole shown in the above screenshot. In the basement, there are gold, food, Sokolov's health elixir, Piero's spiritual remedy, two books and yet another yard key.
The right part of the yard, behind the High Overseer's building may be reached from here in three ways - by opening the gate with one of the acquired keys (the above screenshot), by getting through the ventilation shaft as a rat, or walk on pipes above and other objects adjacent to walls.