Horror in which a pair of demons battle for the souls of a troubled brother and sister. Marc (Don Wood) is an alcoholic struggling badly with inner demons and homicidal impulses. He is estranged from his teenage sister, Wendy (Christine Spencer), whose life is only in marginally better shape. While her brother's addictive impulses stem from his introversion, Wendy's excesses are driven by an extrovert's love of life and passion. Though only a teenager she is pregnant, abuses drugs and has a number of sexual partners. It is little wonder that smoothly-dressed demons, Scadlock (Bradford Scobie) and Glumac (Larry Fessenden), pick the pair as candidates for a demonic conversion. Can any worldly influence, including each other, keep Marc and Wendy from the clutches of the demons?