A One-Round Living Greyhawk Verbobonc Regional Adventure
From the introduction:
The true power rises to claim the Viscounty of Verbobonc as his own. Only a handful of secrets, carefully collected by the heroes of Verbobonc, provide the power to stop him. Now the time has come to battle your way to the schemer before his well-laid plans come to fruition.
A one-round Verbobonc adventure for [characters] level 4 - 15 and the ultimate adventure in the Verbobonc region of Living Greyhawk.