In November 1974, six members of the DeFeo family were found murdered inside their beautiful seaside home. The mother, father, and four of their children were shot in the back as they lay sleeping in their beds. The bodies were discovered by the only family member left alive – the oldest son Butch DeFeo. What really happened that night in Amityville? Who murdered the DeFeo family and why? What caused the strange events in the house near the sea? Parapsychologists and psychics descend on the house to investigate claims of levitating objects and demonic possession in an attempt to explain why, 50 years later, this house is still a source of nightmares.

In 1968, an 8-year-old girl is abducted and raped. The Los Angeles police were just moments from catching her attacker, but he eludes them and escapes to New York where he kills a young woman. This is the beginning of a monstrous killing spree of young girls and women. When police discover who is behind these horrific murders, they are shocked to find it's a handsome, charming photographer. With a string of murders already behind him, incredibly, Rodney Alcala is chosen to appear on the national game show, "The Dating Game." What happens next makes Rodney Alcala one of the most horrific serial killers in US history.