This special Pathfinder Society Scenario is meant to be played by three or more tables of players simultaneously at a convention or other organized play environment. It can be run for characters level 1-11.
The scenario sets in motion the major plot for Season 2 of the Pathfinder Society, in which the "Shadow Lodge" attempts to take over the Pathfinders from within.
It debuted at PaizoCon and Gen Con 2010 and will be put on sale to the general public in the summer of 2011. In the meantime, it is available to convention and game store organizers.