In 1990, Spanish teenager Estefania Gutierrez Lazaro experienced paranormal events that some say led to her mysterious death in 1991. After conducting a seance at school, Estefania claimed she was being haunted by dark, shadowy figures who would call out to her day and night. She also experienced visions, seizures, insomnia, and other puzzling behavior that doctors and psychologists could not seem to fix.

What's more, the poltergeist activity continued after her death. Her family home in Vallecas, Madrid was haunted by black hooded figures and phantom voices. Her mother, father, and six siblings were tormented so severely, that they eventually called police.

As outlandish as the story sounds, Chief Inspector Jose Negri and 5 other police officers claimed to have witnessed paranormal activity at the family home.

Was it hysteria? A poltergeist? A psychological phenomenon? Or was it something more sinister? Perhaps, even, supernatural?