Chúng tôi khẳng định một chân lý hiển nhiên rằng mọi người sinh ra đều bình đẳng, rằng tạo hóa đã ban cho họ những quyền tất yếu và bất khả xâm phạm, trong đó có quyền sống, quyền được tự do và mưu cầu hạnh phúc . . . (Lời Mở Đầu Của Tuyên Ngôn Độc Lập Mỹ)
The film opens with a young Laine Morris and Debbie Galardi playing with a Ouija board in Laine's room, only to be interrupted by Laine's sister Sarah. The scene then forwards to present day, where Debbie (Shelley Hennig) is playing with the board by herself and is so unnerved by what she experiences that she tries to burn the board and planchette before calling Laine (Olivia Cooke). Concerned, Laine comes over but is sent away by Debbie, who goes upstairs only to find the board on her bed. Her eyes turn white and she hangs herself.
The following day, Laine is with her boyfriend Trevor (Daren Kagasoff) at a diner, where they meet up with their friend Isabelle (Bianca A. Santos). Laine receives a text and goes home, learning of Debbie's death. After the funeral, Laine finds Debbie's Ouija board and decides to gather Sarah, Trevor, Isabelle, and Debbie's boyfriend Pete (Douglas Smith) to hold a seance.
They make contact with someone who is identified as D, who Laine immediately believes is Debbie. Despite this, the group is too frightened to continue playing. A couple nights later, they're drawn back to the board after each person finds the message "hi friend" in various locations. Upon further interaction with the board, the group discovers that the spirit is not Debbie. Laine looks through the planchette and sees a young girl with her mouth stitched closed, who then warns the group to run from her mother. The group heads home, only for a malicious spirit to follow Isabelle and murder her. Pete and Laine research Debbie's house and find that a young girl was placed in a mental institution after killing her mother, who she claims killed her sister, Doris. The two travel to the institution and meet Paulina Zander, who states that their mother killed Doris and sewed her mouth shut because she believed that spirits were trying to communicate through her.
Trevor and Laine head home and unleash the spirits of Doris and Mrs. Zander. Doris overcomes her mother and the group believes that everything has been resolved. Unfortunately, this is not true as Pete is later killed by Doris. Laine confronts Paulina about this, only to realize that Doris and Paulina were the evil ones and that Mrs. Zander was trying to stop them. Laine's grandmother tells them that the only way to stop the ghost is to burn Doris's body and the Ouija board. Trevor is also killed before Sarah manages to locate the corpse. Both Sarah and Laine are attacked by Doris and it is only through the intervention of Debbie's spirit that the girls survive and manage to burn Doris's corpse and the Ouija board, destroying Doris. The two sisters return home, only for Laine to find the planchette waiting for her in her room.