Horror movie idea-Found Footage: the Story of the Houdini Killers (I should probably mention that the serial killers in this film are completely fictional).

The movie starts with a narrator explaining how from 1985-1998, a couple named Walter and Linda Hamilton murdered 18 people in Provo, Utah. The victims were mostly homosexuals and convicted criminals, people nobody would really miss, and they were robbed of their cash, murdered and thrown in the Hamilton House cellar. Once the police started to close in on their crimes in 1998, they disappeared. 11 years later in 2009, six young adults go to the Hamilton House to explore it, they have cameras to record their experience. The narrator says that all but one of them were murdered and thrown in the cellar. The police find the tapes and most of the rest of the movie is what's on those tapes, and they end with Walter holding one of the camera while coming towards the only survivor, Jessica Hoffman, while she screams. The narrator then explains that that Jessica was held captive for another 5 years, and she was hidden in a secret room with Walter and Linda whenever the police came to try and find the killers and their captive. In 2014, Walter broke his neck when falling down the stairs and died. The grief-stricken Linda kills both herself and Jessica. The bodies were found three months later, when the police came and found them lying in the cellar.