The Black Market returns in Mission 4 and it says you need a key, or do you? This guide will tell you How To Get Into Black Market Dishonored Death Of The Outsider Mission 4 so you can loot all the goodies for free and even take the key off the corpse if you wish.
Unlike the Black Market in mission 2, there’s no code to access this specific shop. Instead you need to be a little creative with your approach. Head towards the Black Market but instead of going in the house on the ground floor, look up. You’ll see some pipes leading up to a balcony with an opened window.
Once you’re in the room at the top you need to use Foresight to travel through the vent near the rats – it’s by the locked door that leads into the Black Market. Once through the vent place a Displace point in clear view of the main window. Then jump back outside and go down to the bottom floor, working your way up through to the normal Black Market entrance. Once inside you can use your Displace to teleport through the glass. You can now loot the area, kill the shopkeeper, take the key, or whatever you want.