From the back of the book:
Stop A War Before It Starts
After years of neutrality, the honeyed tongues and diabolical gifts of devil-worshiping ambassadors from Cheliax have finally convinced Baron Vendikon of Andoran to pledge his allegiance to the enemy. Now, as the baron’s conflicted subjects hastily fortify his position and a reluctant Andoren general marches on the tiny town of Piren’s Bluff, a few brave souls must infiltrate the tyrant’s stronghold and put an end to his treason before one man’s arrogance costs hundreds of innocent lives.
Tower of the Last Baron is an infiltration adventure for 5th-level characters compatible with the world’s most popular roleplaying game. Within you’ll find information on the lively and strategically important town of Piren’s Bluff, Baron Vendikon’s keep, and the strange beasts and loyal minions that aid the turncoat noble, as well as notes governing the town’s many spies and dissidents.
This adventure is set on the border between two nations in the Pathfinder Chronicles campaign setting, but can easily be set in any game world. It can be used on its own or combined with its sequel, Treasure of Chimera Cove, to create an even greater campaign arc.