Pick Up the Bread, then you will see a note. Pick up the note then the key and escape from the cell.
Pick up the city watch sword nearby.
There will be some enemies nearby, three to be exact.
Dispose of them, See Chaos section for more Information on taking out enemies.
Go up the stairs towards the marker. There will be some swords and pistols nearby. Pick up the pistol, then the next one for some bullets.
Head to Interrogation room, pick up coins along the way. Cooper wire, Esseneces or perfumes all count as coins. See items section.
Look for the safe via marker in the Interrogation room. It has no combination so just open it. Pick up the explosives.
Head through the prison yard and dispose of the enemies.
Look for food in the booth, and hit the switch for door control, there will be some food nearby.
Head towards the marker and take down some more enemies. Then plant the explosives, and run away from the door. Once it explodes, go through the door. Then finally jump off the stones into the water.
Swim towards the marker which is the sewers. You can run faster with your guard down.
- Sewers -
Climb up top the brown blocks and on top of the cage, pick up some food nearby.
Avoid the rats and continue to follow marker. Swim under the gate hole towards marker.
Turn the Wheel, to open up the gate. Eventually you will be in a room with dead bodies and bunch of rats.
Pick up a dead body and throw it near the rats. Then we then go to eat the body, turn the wheel.
Continue following marker watch out for trip wires. Open the supply case, see Gadgets section for more information. Open the door with Dunwall sewer key as well.
See safes section for more information The Combination is 451, it is on the wall near the safe near the whiskey bottles.
Contiue onward and kill 2 more enemies until you get near the marker and a train passing by. You will meet Samuel, he has an escape boat to the Loyalist. Take it and this will complete mission one.