Mary-Claire's life is turned upside down when a demon first started haunting and then started killing her fellow nuns in Tre Fontane Abbey in Rome. She is running away from the demon as she could feel that she was its final victim. Her faith and vows, she had taken when she promised her life to HIM, are taken to its limits when the real fear and her beliefs were fighting to win over her. Will Mary Claire can get rid of this demon from hell?