From publisher blurb: The heroes are hired to conduct medical scans on a backwater planet. But what promises to be an easy mission with quick money becomes anything but as the heroes find themselves pawns in a shadowy game played by someone else’s rules. Can they realize the growing danger and deal with it? Or will they become casualties of plans made long ago and waiting to come to deadly fruition? That Which is Hidden is a short adventure for 2D6 science fiction RPGs such as Cepheus Engine and the Original Science Fiction Roleplaying Game.