Caoilfhoinn (pronounced Key-linn) is a domestic servant from Ireland who emigrated to New Orleans in her late teens.

She works for Louis (Joe’s brother). Now Caoilfhoinn must once again leave her home, accompanying Louis and Joe in their evacuation across the lake. This time it's due to "the Jack".

Dispatches from the Northshore:

“If many people died in the pursuit of immunity, it did not matter: there were shiploads of people arriving to replace the dead. And if yellow fever could not be cured or stopped through public health measures, the commercial-civic elite argued that its deadliness could be transformed into a social panacea, weeding out the weak, immoral, and unworthy. Acclimation was so important to a white migrant’s life and prospects that it was locally referred to as a ‘passport’ to riches, a ‘rebirth,’ or the ‘baptism of citizenship.’”
-Kathryn Olivarius