The story follows Kristen, a young woman who is committed to a mental institution after being involved in a traumatic event. Inside the ward, she encounters four other women: Sarah, Iris, Emily, and Zoey. As Kristen adjusts to life in the hospital, she begins experiencing terrifying supernatural events. She discovers that a ghost is haunting the ward, targeting the patients.

The ghost is revealed to be the spirit of a woman named Alice, who was burned at the stake by the other patients years ago. Kristen realizes that she must confront this vengeful spirit before she becomes the next victim. The film explores themes of trauma, memory, and guilt as Kristen uncovers shocking truths about her own past and her connection to the ghost.