When a traumatized young woman in a grief counselling group suddenly dies, a trio of friends from the group decide to find out what really happened.

Catherine and her family recently moved into a converted church. Upon moving in, they have been harassed by an unknown religious stalker, claiming them to be sinners. Pamela, Catherine's grandmother soon begins to reveal she has secrets hidden to the local church, and not all is as it seems. Each night the Nun returns, and this time, she is looking to claim more than one soul.

A group of stressed-out individuals decide to take a weekend getaway at a peaceful bed and breakfast in Kent, England. However, their relaxing trip takes a horrifying turn when they encounter a demonic nun who constantly knocks at their door. As they struggle to escape the clutches of the evil presence, tensions rise and secrets are revealed. Will they be able to survive this nightmarish ordeal?