Catherine Gordy is a difficult teenager who has done a lot of bad things in her short life. She faces imprisonment, but she accepts an alternative punishment and is sent to study at a closed boarding house for girls. There are strict rules here, but they do not frighten Catherine in the least. The headmistress of the educational institution Madame Duret is a very mysterious person who is trying to bring out the hidden talents of her students. But most of all, the girls are afraid of the strange things happening in the forbidden wing. At night, they constantly hear screams that lead them to think about the existence of supernatural forces. Katherine decides to sort out everything that happens ...