Talk to Fargrim, the dwarf thief, and he will give you an item. You need to give this item to someone else by reading the description. You will then receive another item that you need to give to someone else, guided by a hint from the description.
Just go to count( where maybe you have attended auctions) he will give you a rock then take that rock to bakery in Dwarf area she will give you a bread then trade it to the old where you once trade for fish and get the stone slab then go to the temple and use it as a key to open the wall.
The dwarf gave me his fork, his tool for unlocking treasures and I gave it to the count, the count gave me a unusual rock and said do whatever you want and even when I tried to trade it to the old man,he refuses, now I can't figure out what to do.