User Summary: Campaign sourcebook for the Twilight Sector region.
From the introduction:
Referees who want to run Beyond the Open Door will have to be able to find a suitable framework to bring characters into the adventure. For characters who are established troubleshooters (or troublemakers) we have a few suggestions to help. This section will also help Referees who are starting fresh and would like to provide some guidance to their players as they generate characters. Finally, there are pre-generated characters on a unique storyline which Referees running their first Twilight Sector Setting game or a Convention game might be interested.