Publisher's blurb: Unusual allies, unbridled chaos and an Underdark mystery await characters in this dark 4-hour adventure for 5th to 10th level characters. A mysterious resident has taken over an abandoned castle along a perilous trade route. Now, strange happenings have the traders spooked and there is concern about the economic fallout. Adventurers are dispatched to make a deal with the paranoid and potentially unstable occupant.