I can't give much wide sweeping advice, but does the PC still have the cursed item? What I did was have a 'benefactor' that was quiet obviously evil-ish offer to cure the guy of the curse for free and take that nasty cursed item off his hands for safe keeping too. It seems like a great deal, but it led to some interesting RP as the guy wanted to be cured, but the rest of the party did not want to give the cursed item away, fearing it would be used for ill.
If they do give it away, other important people get struck down the the curse at some point, or in the case of a book, as cult starts up exploring its dark secrets.
If they do give it away, other important people get struck down the the curse at some point, or in the case of a book, as cult starts up exploring its dark secrets.