Bentley

You'll find Bentley near the fireplace inside the Inn. After offering to "help" he will ask you to retrieve a key from a table in his abandoned farm house in East Perennial Trail.

Once you receive the quest you'll want to head South West from Soltown to East Perennial Trail. Once you enter the zone, his farm house is directly to your left. Enter the house and you'll find the key sitting on the solitary table in the room.

Return to Bentley click on "key" in his text box and give him the key. He will reward you with 2500 exp and 500 gold.

PS. Doing this quest at the same time as Geof's quest would be wise since it send you to East Perennial Trail also to kill undead for an Iron Blade.