Scarlett should enter Lea's home on one of the residential platforms in the upper levels of the Arsenal District and speak with her. Lea will then explain her problem and asked Scarlett to help. (Click on the map to enlarge it.)
Lea wants to know where her husband, Joseph, is. He is supposed to be at The Doctor's office down at the lower level, but he has been gone a long time. Worried, Lea asks Scarlett to see if Joseph is all right.
After getting the quest, Scarlett should go to The Doctor's office down in the main level of the Arsenal District (1) on Shade Street. The Doctor, Gregorius, will tell Scarlett that Joseph isn't there, and suggest that she check in the Ambrosial Lotus, instead. (Click on the map to enlarge it.)
To get to the Ambrosial Lotus (2), a brothel, Scarlett should go to the base of the stairs at the main level of the lower Arsenal District (same level as the Doctor, just across the bridge.) There, sitting at a table on a raised box seat to the right, she will find Joseph. Scarlett should speak to him, and he will beg Scarlett not to tell his wife where she found him.
- On Holy Mission - Brother Johan can be found in this same residential apartment when Scarlett returns with the Sacred Scrolls.