Nicole Rawlins, an investigative journalist, travels to Romania to cover the story of a priest who stands trial for the murder of a nun. The priest claims the death occurred during an exorcism gone wrong. Determined to uncover the truth, Nicole learns about the victim, Sister Adelina Marinescu, and the alleged supernatural occurrences surrounding her life and death. As Nicole interviews various individuals connected to the case, including the priest, Father Anton, and witnesses from the village, she grapples with conflicting accounts and her own skepticism about demonic possession.

As Nicole delves deeper into the dark history of the exorcism and its spiritual implications, she begins to experience increasingly disturbing phenomena herself. Through her investigation, she uncovers a sinister force that challenges her rational beliefs and puts her faith to the test. As the line between reality and the supernatural blurs, Nicole finds herself facing dangers that could have dire consequences for her own soul.