This adventure takes place in the River Quarter of the Free City of Greyhawk and was printed in Dungeon Magazine #114. The adventurers investigate matters relating to the Cult of Vecna, which leads them to the Tomb of Blood Everflowing in the Cairn Hills. Barge End is a great dock map that was used as a chase scene in the original adventure. The player versions of these maps will allow them to be placed anywhere.
High Resolution and Player Versions of these maps can be found here: https://www.patreon.com/posts/mad-gods-key-116461146
Cartouche heraldry by Anna Meyer, used with permission. Visit her page here: https://www.annabmeyer.com/