In 1981, Ed and Lorraine Warren, a couple of paranormal investigators, face their most chilling case to date. It all begins when a young man named Arne Johnson commits a brutal murder, claiming he was possessed by a demon. With this shocking twist, the case becomes an unprecedented legal battle as Arne attempts to use possession as a defense in his trial. Meanwhile, Ed and Lorraine cannot ignore the dark mystery behind this event.
Determined to uncover the truth, the couple delves into a disturbing world of hidden cults and malevolent powers that threaten not only Arne's life but also that of his girlfriend and anyone else who crosses their path. In their search for answers, the Warrens encounter a demonic presence more powerful and dangerous than they ever imagined, testing their faith and the strength of their relationship. Amid dark rituals and eerie scenes, the line between good and evil becomes increasingly blurred as they try to prevent evil from taking over those they love. With a blend of psychological horror and supernatural elements, everything culminates in a confrontation that will change their lives forever, revealing that sometimes true horror lies beyond what the eyes can see.