This is the story of a psychiatrist named Suzanne Mathis who helps a mysterious girl named May, who has escaped from a cult. The life of the main character is turned upside down when the arrival of this girl threatens to harm her family. Fifteen-year-old Julie Mathis comes home from school and discovers an unfamiliar girl sitting in the kitchen. Her mother, a psychiatrist, informs her that May is one of her patients who will be staying in their house for a few days. No one suspects yet that May will not want to leave...