Sister Anna is convinced that her calling is to fight demons. She knows that as a result of dramatic events in her childhood, she has acquired a special gift. However, the church rules are clear - only priests can be exorcists. For women, meeting a demon is a hundred times more dangerous. Anna's desire is stronger than fear and reason. Her master and mentor allows her to participate in the process of training exorcists from the position of an observer. During one of the frightening sessions, Anna experiences the presence of a demon of incredible power. He is too powerful an opponent for novice exorcists, their souls become easy prey for him. Soon it turns out that the only person able to face him is sister Anna. It is not their first meeting.