The players begin by sitting a pub and are visited by a Patronus in the form of a squirrel. The voice emanating from the squirrel is recognized as the leader of the American District of the Aurors Office.
The players are given the task of hunting down Stuart Venable.
They are informed that he is a rogue wizard who flunked out of his psychological evaluation to become an Auror and thus decided to practice the Dark Arts.
The players are given the location of his former residence in Washington, D.C. as well as what charms are hiding it from muggle eyes (disillusionment).
At the house they find that it is completely deserted save for a glock 23 pistol upstairs on a stool and a map of Washington, D.C. with a small section circled with and X through it on the Dining Room table.
When they visit the location on the map they find the house to be similar to the former residence save for a dead body being in the living room who has a glock 23 pistol, bluetooth earpiece and a disposable cell phone.
Upstairs sitting on stool is Stuart who, upon seeing the players, says, “By doing this I have become more powerful than anyone ever has! The Grim shall rise to glory!” at which point FBI Agents break into the house through windows and doors.
After killing Stuart and getting captured by the FBI they discover the one they killed was an imposter who took polyjuice potion.
Eventually once they got their wands back they apparated themselves and Stuart to the former house, which they set up as their home base.
Using Legilimens on Stuart, the players discovered everything about Stuart, The Grim, Joseph, and Hunter 2 save for some operations and how Hunter 2 was planning on attacking the American District of the Auror Office.