A One-Round Living Greyhawk Gran March Regional Adventure
From the introduction:
They say that vineyard in Orlane is haunted, but the Gran March army says it isn’t so. Adventurers wanting to test their mettle are now flocking back to Orlane to kill undead. Will your group of adventurers find out the truth?
A Gran March regional adventure for [character levels] 4 - 12, and the epilogue of the Shadow, Sun, and Sword series.
Note: This adventure will be of particular interest to wizards and druids.