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Three brothers, Selma, Emre and Ayşe, went for a little stroll by the river near the city they live in. This is a different trip because Selma and Emre are going to sacrifice their little sister Ayşe, who is deaf and dumb according to their family's traditions and beliefs, on her thirteen birthday. But Emre will try to resist this situation.

American professor John Holden arrives in London for a conference on parapsychology only to discover that the colleague he was supposed to meet was killed in a freak accident the day before. It turns out that the deceased had been investigating a cult lead by Dr. Julian Karswell. Though a skeptic, Holden is suspicious of the devil-worshiping Karswell. Following a trail of mysterious manuscripts, Holden enters a world that makes him question his faith in science.

Joana, fearing the dark and the sensation of being watched, faces a night of terror. As she battles her fears, she is consumed by the paranoia that something is lurking in the shadows. With every sound and every shadow becoming a threat, Joana struggles to keep her sanity as she confronts her deepest fears.