The Vatican sends a priest having a haunted past and a novitiate on the brink of her final vows to explore when a new nun at a abbey in Romania takes her own life. They detect that the unholy secret of the order. Risking not their lives but their faith and their very souls, they face a brute force in the form of the identical demonic nun that terrorized crowds in"The Conjuring 2" whilst the abbey gets to be a horrific battleground between the living and the damned.