The story follows Detective Mark Lewis (played by Frank Grillo), who is investigating the gruesome murders of three people in a suburban house. The sole survivor, a young woman named John Doe (played by Dustin Milligan), is found in a state of shock and is the prime suspect.
During the investigation, it is revealed that the house was the site of a failed paranormal experiment led by a professor named Elizabeth Klein (played by Maria Bello). The experiment aimed to make contact with the afterlife, but things went awry, leading to the tragic events.
As Detective Lewis delves deeper into the case, he discovers recordings of the paranormal experiment that document the terrifying events that unfolded within the house. The supernatural occurrences involve demonic entities and the possession of the participants.
In the climax, as Detective Lewis confronts the supernatural forces within the house, the true nature of the demonic presence is revealed. The film explores themes of the supernatural, the consequences of meddling with the paranormal, and the blurred lines between reality and the supernatural.
“Demonic” received mixed to negative reviews from critics, with some praising its atmosphere and tension but criticizing its plot and execution. The film incorporates elements of found footage, traditional horror, and supernatural thriller genres.