When the mission begins, Samuel will drop you off at the same spot as when you began High Overseer Campbell. Go forward and up the first set of steps, where you'll find a guard, so sneak up behind and kill him. Go up the next set of stairs and look up and to your left, and you should see a Watchtower, so avoid that way for now and head to the right.
When you approach the archway, a thug will mention thaty Slackjaw wants to see you. Go inside the Whiskey Distillery and you'll be in a neutral zone, so there's no need to worry about sneaking. Head your way to Slackjaw and talk to him. He has some side missions for you, with the second taking care of the Pendleton twins nonlethally (which you don't want for this playthrough). As you're leaving, you might run into some Weepers outside, so take care of them.
SLACKJAW - FINDING CROWLEY
When you're back in the main area, the alley to the right has some Assassins, two of which are in the rooms with the balconies, and a third on the roof up the nearby stairs. It's best to leave these alone, as they have the same kind of powers that you do, so go back to the beginning area with the Watertower.
There are three guards here, two of which are walking around and one being inside the guard structure. Take them out if you want, otherwise go over the wall and into the second area. Galvani's Offices is on the left, and there's a guard on the middle balcony, which is where you need to go, since the top door requires a key. Once you're inside, there will be two guards by the fireplace, so if you want to be sneaky, hide in the room on the right side, but be careful of rats.
Your objective is on the third floor, so once the two guards are killed on the second floor, go up the stairs and you'll find another two talking over the body. Once again, you can find in the side room, but you have to be careful of rats. You can reach the body without killing the guards, as you just need to get the Audiograph next to the body. When you get the Audiograph, head back to Slackjaw, who has another side mission for you, which is to get the combination for the Art Dealer's safe.
TO THE GOLDEN CAT
The Art Dealer is inside of The Golden Cat, so start heading in that direction. You received a key to the Captain's Chair Hotel from Slackjaw as a reward for his first side mission. This will allow you to access the Golden Cat via the rooftops. For now, though, go into the second area of the Distillery District.
There will be some guards walking around, two of which follow the same exact path. There's also another 1-2 guards in the area, so take them all out before moving on to the next area. If you want to do some looting later on, the best path to the third area is via the Bottle Street Gang alley from High Overseer Campbell.
Go down the stairs on the left side of the second area, being aware of the Weepers to the right, and head up the left alley. There are two guards harassing a woman, so either help her out or wait until they kill her; either way, you can get the key to the Art Dealer's Apartment.
There are a couple of guards in the third area, but none of them really patrol too close to the entrance of the Captain's Chair Hotel. Kill them if you want, then head through the hotel. There are some rats that come down the stairs as you start going up, so hop on the bed or other raised platform and kill enough so they run away. Go all the way upstairs and through the door, to the Golden Cat.
THE GOLDEN CAT BATHHOUSE
Go across the rooftops until you get to the main building. You'll see a guard moving around in the courtyard, so dispose of him and go back up to the higher ledges. You want to get into the building through an open window on one of the ledges, but it is wise to take out the guard standing around on the one balcony.
Once inside the building, a guard and Madam Prudence will be talking and when they're finished, she will retreat to her office, while the guard will walk around in that room. Take him out, then walk through the door on the right, then through the next door straight ahead. Either kill Prudence or sneak behind her and steal the Master Key, which you will need to escape.
Go back to the previous room with the winding stairs, and approach the double doors. Two guards are conversing on the other side and one will come into the room you're in once they're done. Kill him, go through the doors and go to the right to kill the other guard, who is on the balcony.
Continue making your way through the building, and if you want the Art Dealer's combination, go into the room where he is located. Keep pulling the lever to electrocute him until he gives you the combination, then pull it some more to kill him.
Depending on where the Pendleton twins are located, it might require some extra work. They can be located in two of four rooms, which changes depending on each playthrough you do of the mission.
- Smoking Room - One is inside with a Courtesan. You can go outside of a window and go along the ledge. There is a broken window that you can shoot a bolt through, easily hitting him in the head.
- Ivory Room - This is similar to the previous room, only there's no window you can use to shoot him. Creep around the bed and kill him as fast as possible.
RESCUING EMILY
After you kill the Pendleton twins, it is time to find Emily. Hopefully, you have gotten the Master Key from Prudence, as you will be needing it to escape after getting Emily. Go back to the staircase that leads up and down, right outside of Prudence's office.
Go upstairs until you get to the top floor. Emily is inside of the middle room, and when you free her, she will run downstairs to the VIP Door. Follow her down and unlock it with the Master Key, which will allow her to escape to the boat with Samuel. You can make your way back to Samuel or do the next optional objective.
(OPTIONAL) ART DEALER'S APARTMENT
The Art Dealer's Apartment is important, because it contains three Sokolov Paintings, as well as a Rune. Also, if you loot the safe before returning the combination to Slackjaw, you will get the Art Dealer achievement/trophy. Since you should have gotten the key above, go to the second area of the Distillery District and climb to the third balcony, then go inside.
Once you're inside, there will be two thugs right inside to the right, looking at the safe. Go up behind them and kill them both, then input the combination you got from the Art Dealer. Loot all the goodies inside and search the rest of the apartment for other stuff. Once you're done, head back to Samuel to finish the mission.
