Insidious: The Last Key is a 2018 American supernatural horror film directed by Adam Robitel and written by Leigh Whannell. It is produced by Jason Blum, Oren Peli, and James Wan. It is the fourth installment in the Insidious franchise, and the second in the chronology of the story running through the series. Starring Lin Shaye, Angus Sampson, Leigh Whannell, Spencer Locke, Caitlin Gerard, and Bruce Davison, the film follows parapsychologist Elise Rainier as she investigates a haunting in her childhood home.
The film was released in the United States on January 5, 2018, by Universal Pictures. It grossed $167 million worldwide, the highest of the franchise, and received mixed reviews, with praise for Shaye's performance but some critics stating that the franchise had run its course.
In 1953, young Elise Rainier lives with her parents Audrey and Gerald, a prison executioner, and her brother Christian, in New Mexico. Elise claims to see the ghosts of the prisoners that have been executed, alarming her parents. One night, Elise encounters a ghost in their room. Frightened, Christian looks for the whistle their mother gave them to call for help, but it is lost. Gerald, furious, beats Elise and locks her in the basement. A demon called "Key Face" comes through, possessing Elise and killing Audrey by hanging her. Gerald arrives to find Elise and Audrey's body.