As you were wandering around a town called Nell-Zon near the Main Hall, a seemingly crazy old man approached you. Half of his utterings were not coherent, but he was saying something about "hidden treasure right in the alley". He also was going on about wealth to be had just for rewards and bounties for some characters hiding out in some old buildings.
You're sure the old man must have escaped from a local booby hatch, but you decide it can't hurt to check out some of these stories.
You do remember something about a poster in the bank giving a reward for recovery of some counterfeit gold coins, so maybe there is something to the old man's tale after all...