Melinda investigates the haunting of a very old house she was initially looking into for it's antiques. She makes contact with Cassidy, the ghost of the daughter of the couple who used to live there. Cassidy is terrified and warns Melinda to stay away. While the family was living there, Cassidy used to fear the ghosts in the house that were making her do things. Because she was sick with Louis Barr syndrome, her parents never took it seriously. Melinda looks deeper into the house and finds that a Madame Greta, in a wheelchair, lived there and used to hold seances to contact the dead and more specifically, ghosts of murderers and those who were falsely accused but still executed. Madame Greta, a ghost herself, is now helping the Shadows, made up of these murderers, collecting the ghosts of young children so they can grow stronger by feeding off their guilt and fear. She won't let Cassidy leave and go into the light, using her to tempt other children's ghosts. Melinda, Eli and Ned try to battle the Shadows to free Cassidy and her ghost friends but they're proving to be a formidable opponent. Delia, who's resisted helping until now, shows up in the nick of time and saves the day.