Risen

Chapter 1 (Harbor Town)

Start this questline by talking to Arno just inside the rear gate to Harbour Town. This will put "The farmer's sick wife" in your journal. Next you have to complete the quest "Medicine for everyone" (see the "Samaritan" achievement). Once all potions have been delivered, talk to Belschwur to follow up on getting Martha somewhere to sleep. Head over to Costa and pay 30 gold for Arno and Martha to move into his hotel upstairs. Tell Arno they can sleep there, then talk to Martha who will reward you with a cooking recipe.

Note that this quest can only be completed after resolving the issue of Costa's money, either by returning it (Order side) or giving it to Delgado (Don side).