Twenty-five years after a tragic incident involving a religious cult, the lone survivor returns to the scene with a documentary film crew, led by a determined filmmaker. The cult, known as Heaven's Veil, had committed mass suicide, or so it was believed, with their motivations shrouded in mystery. The survivor, having been a child at the time and found with no memory of the events, is haunted by the loss of her mother and the unanswered questions surrounding the cult's final act. The filmmaker hopes to uncover the truth behind the cult's demise and provide closure to the survivor by exploring the secluded compound where it all ended.

As they delve deeper into the investigation, the crew uncovers unsettling video recordings left behind by the cult, which hint at dark rituals and possibly supernatural occurrences. These revelations challenge their understanding of what truly happened, suggesting that there might be more to the cult's mass suicide than initially thought. The eerie atmosphere of the compound and the cryptic messages from the past begin to take a toll on the group, blurring the line between reality and madness. The deeper they venture into the secrets of the compound, the more they find themselves entangled in the cult's final, sinister legacy.