During the wine festival, Roger is accompanied by his wife Cora Highberry, the wine connoisseur Master Meztli, and several other guests.
Cora is one of the murder targets during the quest Investigate the Murders. "Master Meztli" is actually the Bhaalist aspirant Dolor, who seeks to kill Cora and chop off her hand to gain the approval of the Murder Tribunal and become an Assassin of Bhaal.
Depending on the options selected, Roger may be poisoned by Dolor and his wife can be poisoned. If Cora is poisoned, the party can inform him about the list of murder targets and he will go to her.