A One-Round Living Greyhawk Principality of Ulek Regional Adventure
From the introduction:
A noble family in Gryrax needs your aid in a small matter. There's blood on the stairs and one of the servants is missing. Did the butler do it? In the ballroom? If you solve the mystery then you get to go to a party.
A Principality of Ulek regional adventure for APLs 2-6.
Note: This adventure will be of particular interest to those with an interest in eight-legged vermin.