Nell Sweetzer is found terrified and alone in rural Louisiana, with no memory of the horrific events involving demonic possession that she had previously endured. She is placed in the care of Frank Merle at a New Orleans home for women, where she tries to move on and start afresh. As she begins to adapt to her new life, Nell gets a job as a hotel maid and even starts experiencing the beginnings of an innocent romance with Chris, a kind co-worker. However, she soon starts to suspect that the demon that once possessed her, Abalam, hasn't gone away and continues to haunt her.

As unsettling occurrences start escalating around her, Nell's mental state begins to deteriorate. She experiences visions and strange phenomena that make it clear that something malignant is pursuing her. She seeks help from various sources, including a local priest and a secretive organization familiar with occult practices, all in a desperate attempt to rid herself of the evil force. Conflicting advice leaves Nell uncertain about whom she can trust. The gripping tension builds as it becomes evident that escaping or defeating this malevolent presence may require extraordinary measures beyond human capabilities.