When a young girl from a Romanian monastery decides to put an end to her life, a priest whose past is quite disturbed, with a young apprentice close to taking the final oath to become a nun, I am sent to the place by the Vatican marshals to investigate in more detail. Together, the two discover a superhuman terrifying secret. By endangering not only their own lives but also their beliefs and souls, they face an evil force that took over a nun and the monastery turns into a battlefield between the living and the demonic forces.