Karn Bay is the city where our four ‘heroes’ met, and likely the home town of at least two of them (Hannibal Ocean & Rinn the Stout). While there the four were employed by the local crime lord The Duke. The four were forced to flee when they were framed for the rape and murder of The Duke’s daughter Sasha, which they firmly believe was carried out by Nikal ‘Nasty-Nik’ Fenwater.
Karn Bay is one of the larger cities in Jahrain. For the purposes of this campaign it has intentionally been kept very loosely defined, and is used only to define the place that the PCs have fled from.