 Louisa Krause stars as the titular Ava, a young woman that must learn how to put her life together after a demon is exorcised from her body.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 possessed by the demon Naphula.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.