The film opens with a priest (John Ventimiglia) successfully completing an exorcism on Ava (Louisa Krause), who is stunned to find that she has spent the last 28 days Demonic possession by the demon Vapula. She's initially flippant towards her actions during this time, but soon discovers that she caused serious emotional and physical damage, resulting in her losing her job, friends, and boyfriend, as well as potential jail time. Ava's parents (William Sadler (actor) and Deborah Rush), sister (Whitney Able), and her sister's fiancée Roger (Zachary Booth) are all concerned for her and push her into accepting a plea deal that would spare her jail time or commitment in a facility for troubled ex-possessed people as long as she attended a rehabilitation program for the recently exorcised, as possessions are seen as real, common phenomena in this universe. The program is led by Tony (Wass Stevens), a gruff man that insists that Ava take the program seriously as to do otherwise would just raise the likelihood that the demon would return, as repossessions will frequently happen. Participants will ultimately be tested by wearing a necklace that invites the demon back into their body. If they can pull the necklace off and reject the demon, they graduate since this shows that they are strong enough to deter future possessions. At one meeting Ava meets Hazel (Annabelle Dexter-Jones), a fellow ex-possessed person that ''wants'' her demon to return since she enjoyed its presence and felt that it was "special" for both of them.