Someone has been raiding the coast. The PC’s are dispatched to help - but can they trust the local authorities?
The mentor of one or more (lawfully-inclined, socially ambitious) PCs is vulnerable because of a past action Ã¢â?¬â?? an action that was justifiable at the time. But opponents can now use changing circumstances or new information to discredit or destroy the mentor and damage the PC. The mentor is unwilling/unable either to respond or escape the consequences. The PCs can take action, but not in the open; ‘kill the monsters’ is not likely to solve the problem. Failing to act will doom the mentor and damage the PC; taking action may also doom the PC.
The local band of 'nasties' (goblins / orcs / whatever) lives in relative peace with the local population.
Along come the PCs and go through their usual heroic monster bashing routine, wiping out the nasties and pinching all their stuff, then continue on their way.
Problem is, they don't kill ALL he nasties. The survivors want revenge and, after spending a few months recovering, start to take it in their own inimitable style (which is not unlike that of the PCs come to think of it).
Next time the PCs are in the area they find themselves VERY unpopular with the townsfolk.