"Sub Rosa" is an investigative adventure featuring the secret societies of Heaven & Earth. It can be run as a stand-alone session or as part of an ongoing series with no alterations required. "Sub Rosa" is designed as an outline, allowing gamemasters to customize the specifics as needed. It is recommended that the GM read the entire adventure thoroughly so he is completely familiar with the events of the story. This will allow the GM to be fully prepared when the players choose to pursue different directions over the course of their investigation.