The Devil's Nightmare (2012)

Dr. Henry Rhoneberg has developed an experimental technique to completely cure people of the vices that rule their lives and has gathered a motley assortment of addicts - from an easily angered alcoholic to a rock star with a love for excess (is there any other kind?) - to a remote facility for treatment. No sooner does the group settle in before interpersonal relationships begin to conflict, people fall into bed, a mysterious stranger arrives at the door...and then the killing starts...