 In Spain, the vanished six years old daughter of the editor Claudia (Emma Vilarasau) is found completely mutilated in a well by the police, being recognized by her husband only due to a bracelet and her shorter leg. Five years later, Claudia, divorced and addicted in tranquilizer, receives a short phone contact from her daughter. She looks for the former detective in charge of the investigation, and together with a reporter of a magazine of parapsychology, they find the existence of a diabolic sect called "Los Sin Nombre" that searches the essence of pure evil.