First off, you ain't stupid.
Spoiler
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Okay-dokey, I forgotten the locations, but I know the steps and things needed. First, before entering the Prison, bring along some Holy Water, you can buy some from the Temple in Saradush.
You meet the spirit, search the barrels behind him to find a skull. Kill vampires, lalalala, you meet him again, find a necklace...
A vampire is guarding it in a cell I think.
... you have all the items, remember he pointed at some grave? Press your TAB button to highlight the grave, place the items in the grave. Voila, mission accomplish.
This is a damn good quest for Mages!
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If not a Sorcerer casting total oblivion, then a Paladin meting out justice. Otherwise, I think I will just be a bard and torture my enemies with, "My Heart Will Go On".
Platinium Sorcerer of ALSB,
Aerie
Loving
Sacred
Band! She's MeowRrrr, and more!
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Baldur's Gate Item Mart