There was a moment that was truly sweet, that allowed me to revel in the warm glow of rat bastardliness that comes when the players realize they are well and truly screwed.
The campaign centered around a small village in a feudal kingdom. One of the PCs was the adopted daughter of the village's only knight. First game the village is attacked by goblins - and her father is poisoned. After dealing with the immediate threat, they travel to the city to get some herbs to cure the old man and beg the baron for some troops.
The baron readily agrees and sends his personal physician to heal her father and his cousin to rule in his stead (as a woman and adopted the PC was ineligible for lordship). The new lord then sent them on various missions to find out what happened while her father healed. First he told them to strike at the barbarian tribes. The savages were known to use poison and must be in leauge with the goblins.
Well, they talked before attacking and realized the barbarians had nothing to do with it. They were in fact very angry with the goblins as a new mine had been polluting their sacred river. They wouldn't attack as they were quite superstitious and had seen undead about. The PCs clear that out for them and find a note from a 'dark knight' commanding them to create more weapons for the armies.
They take this back to town and give it to the new lord. He says he'll look into it. In the meantime the PC can't see her father, as the healer insists that he needs his rest. And they've temporarily moved her out of the lodge to the inn, to make room for the extra troops. Sounded reasonable to her.
The next mission is a spot that his scouts say is a goblin hideout. A cave just across a rope bridge. They head out and investigate, finding a dragon inside! Not a little one either, a huge dragon and these are like 4th level PCs. They flee....
only to find that the bridge has been cut and several goblins are scurrying into the bushes. Their only chance now is to leap into the river.
They wash up several miles downstream, lost, hurt, wet, and missing most of their equipment. As they talk about what happened, they all look at me with this 'you motherf*******' expression, and the one PC says 'My father! They haven't been giving him his medicine! That's why they wouldn't let me see him!'
Not only had they been set up, but all the evidence of the growing conspiracy they had merrily handed over to the bad guys. And they had no idea how high up the rot went. though they were safe inside the borders of a goodly kingdom, they were utterly alone.
Ahhhhh....