Elise opens a mysterious red doorway and is briefly possessed by a demonic spirit. Gerald, furious, canes Elise and locks her in the basement. Frightened, Christian looks for a whistle their mother gave him to call for help, but cannot find it. Elise and Christian encounter a ghost in their bedroom. In 1953, Elise Rainier lives in Five Keys, New Mexico with her parents Audrey and Gerald and younger brother Christian. 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.

The film was released in the United States on January 5, 2018, by Universal Pictures. Principal photography began in August 2016, and ended the following month. In May 2016, it was announced that Chapter 4 would have an October 2017 release date with Whannell writing, Blum, Peli and Wan producing, Robitel directing, and Shaye returning to reprise her role as Elise Rainier. Talks for a fourth installment in the franchise began in June 2015, with Whannell saying the next film would take place shortly before the first film. 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.

It is the fourth installment in the Insidious franchise, and the second in the chronology of the story running through the series. It is produced by Jason Blum, Oren Peli, and James Wan. Insidious: The Last Key is a 2018 American supernatural horror film directed by Adam Robitel and written by Leigh Whannell.

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