After the mysterious death of her friend Debbie, a teenager named Laine convinces her group of friends to use an ancient Ouija board to communicate with her and say their final goodbyes. Laine, her boyfriend Trevor, her sister Sarah, Debbie's boyfriend Pete, and their friend Isabelle find the board in Debbie's house and begin to use it in an attempt to reach her. Despite their skepticism, the group becomes concerned when they contact a presence known as "DZ". Strange events start to happen, and Laine feels an otherworldly presence following her. They soon learn the rules of the Ouija board: never play alone, never play in a graveyard, and always say goodbye. As they delve deeper, it becomes clear that they've opened a door to the spirit realm that they do not understand.

Laine becomes determined to uncover the mystery behind the Ouija board and the spirits they have awakened. Her investigation leads her to the previous inhabitants of Debbie's house and an old woman named Paulina, who provides cryptic warnings about the dangers of contacting the other side. Laine is driven to find out what happened to Debbie and why the spirits are unsettled. As their encounters with the supernatural become increasingly dangerous, Laine and her friends realize they must confront the spirits if they hope to put things right. Their perseverance leads them down a dark path as they search for a way to close the connection they've accidentally opened.