SO, in between our Deathwatch game and our group starting a Black Crusade game, I am going to do a one off Dark Heresy game. The premise is that the entire squad is made up of untouchables and are an elite witch-hunting team. They will start at around rank 10ish, so Ascension will be used. I plan on having them investigating a new drug that is rumored to heighten user's psy potential. Even users that don't have a psy rating exhibit some degree of psychic talent after use for a short period of time. Obviously, this is not something the Ordo Hereticus (i think that's the right Ordo) would like spread around. That is however as far as I am so far on the plot. I welcome any and all advice for creating this adventure. remember this is a one or two session adventure so nothing too extravagant.
Thanks in advance!