George's killer can be found in Verdistis.
Search the poor section by the Blue Boar inn for evidence of the missing cows.
There is a key to Dr Elrath's house just south east of the house. You don't need to find him again, just search his house for evidence (and something else). If you already got into the house, play with the lanterns...
For the vampire cave you need Telekinesis for the lever or Lockpick for the door, level 2 for both.
BTW, there are separate forums for Divine Divinity and Beyond Divinity.
