A One-Round Living Greyhawk Highfolk Regional Adventure
From the introduction:
The Furyondy garrison at Ironstead has enlisted your aid to hunt down the remaining evil commanders that escaped at the Battle of Shadowkeep. Now that the winter begins to yield to spring, you can widen your search efforts. Your trail, however, leads off into a seldom-traveled part of the southern Vesve Forest. In the Deepmarsh, you narrow your search, confident that your quarry will be found soon... or something will find you.
The Mystery of F.M.A., Part 4.
An adventure for characters level 3 - 8.