In this chilling story of psychological horror, two siblings, Tim and Kaylie, confront a dark chapter of their childhood that has marked their lives forever. Years after the traumatic family tragedy that separated them, Tim emerges from a rehabilitation center, determined to leave the past behind. However, Kaylie has other plans: she believes that a mysterious and ancient peephole that used to be in their family home is the cause of the madness and death that ruined their lives.
Kaylie believes that what lies behind that cursed glass surface has the power to manipulate reality, causing hallucinations, paranoia, and death to those who look through it. With the intention of proving the truth and freeing her family from the dark legacy that has tormented them, Kaylie sets up a series of recordings and experiments to capture the essence of the horror lurking in the house where it all began. However, as the night progresses, the siblings find themselves trapped in a deadly psychological game, where time and reality distort. Memories of the past begin to intrude into their present, leading them into a desperate struggle for survival.
In a confrontation between reason and the supernatural, both siblings must face not only their own demons but also the undeniable terror hidden in the reflection of that sinister peephole. Madness adds to the horror, revealing truths that perhaps should have remained buried.