Rescure a drunken man, Ruben, from the Trade Center tower.
If Scarlett visits the southern area of the Trading Center in the Outer City, she will see a woman in a blue dress, Madeline. If Scarlett initiates a conversation with Madeline, the woman will immediately scold her for traipsing on her just cleaned cobblestones with dirty boots. The woman will also then complain about a crazy drunk (Ruben). If Scarlett questions her about the drunk, the woman will say he is hallucinating that "demons" are chasing him. Scarlett might rightly infer these demons are Lectors.
This quest is optional.
Scarlett should enter the door to the nearest tower and go up one flight of stairs, then go outside. This is the mid-level catwalk around the Trading Center. Scarlett should cross this balcony area to the opposite door, go inside the next tower, and go up another flight of stairs. (There's no way to reach the Ruben's room by entering this second tower at the ground level, so use the catwalk from the southern tower.) Scarlett will find the tipsy Ruben being accosted by a pair of Lectors in a small room there.