This mission automatically starts upon the completion of the last mission, The Flooded District. Go up to Cecilia at the start and talk to her, which begins her explaining what happened. After that, go up the stairs and grab the keys off the wall next to the door, then go through the door to the outside.
There are plenty of guards, as well as Tallboys patrolling around the entire area, so you must be very careful here. When you get a chance, Blink as far left as you can from the two guards walking around and talking, then Blink onto the ledge where the pub sign is. Get onto the vents above the sign ledge, then watch out for the guard on the roof nearby, going onto it and knocking him out.
The first main objective is in your old bedroom, which is guarded by 4 men, 2 of which are talking about Piero and Sokolov. After they're finished talking, they go downstairs, so it's easy to take down the other 2 guards up there. Once those two are snoring, grab the letter from Emily on the desk in your room, which mentions Callista.
(OPTIONAL) HAVELOCK'S PLANS
This optional objective is located in the actual pub, but there are some guards in the way. There's one walking around on the floor with the other bedrooms, as well as 2 possible guards in the actual pub. The plans are on the counter, which mention Piero and Sokolov and their new Arc Pylon. Before going to where they are holed up, go upstairs to the second floor and find Havelock's room, which contains some blueprints (in a bucket) that Piero will need.
(OPTIONAL) RESCUE PIERO AND SOKOLOV
If you've gotten the blueprints from Havelock's room, then half of this side mission is already done. Head back up to your bedroom and go out the window that leads to Emily's tower. Get onto the roof of Piero's workshop, then peek over the water-side edge and Blink to the balcony. Head inside and down to talk to Piero and Sokolov, who mention a new Arc Pylon that can put everyone but all of you to sleep, or turn them all to ashes.
Of course, he first needs a blueprint that Havelock took and stashed in his room, which is on the second floor of The Hound Pits Pub. Bring this back to Piero and he has you make a choice, and since this is Low Chaos, you should choose to put everyone to sleep.
One last thing you need to do is place a whale oil tank in the receptacle up top, so go up the stairs, get an empty tank, and fill it up right next to the dispenser. Go outside and use the vents and path leading to the roof, then place the filled whale oil tank, which will start up the Arc Pylon and put all enemies to sleep. You can now run around to your hearts content, as all enemies are unconscious, including the Tallboys.
TO KINGSPARROW
For the main objective in this mission, pick up the letter in your room from Emily, who mentions going to Callista. She locked herself inside of the tower where Emily was staying, so head there and she'll let you inside. After she's done talking, set off the flare at the window, which will summon Samuel to the beach behind the tower. Go and talk to him, then set sail for Kingsparrow Island.
