Insidious: The Last Key

Spoiler alert! Please do not read the following plot summary if you have not seen the film.This is a sequel that works as a prequel to Insidious. In 1953, a young Elise Rainier lives with her mother Audrey, brother Christian, and father Gerald in New Mexico. Gerald works as an executioner in a nearby prison. Elise claims to see the ghosts of the prisoners that have been killed in the electric chair which concerns Audrey and angers Gerald. One night when Christian and Elise were about to sleep, Elise encounters a ghost in their room which frightens Christian, prompting him to use a whistle given by their mother to call for help. However, the whistle was misplaced before Christian could blow it. The commotion causes their parents, Audrey and Gerald, to enter the bedroom and a furious Gerald beats Elise before locking her in the basement. In the basement, a voice lures Elise to a door which she unlocks. A demon called Key Face emerges from the door and possesses Elise. Audrey investigates and finds the possessed Elise before being hung by a wire controlled by the entity, killing her. Elise is broken out of the possession as Gerald arrives and finds Elise and Audrey's body.

Decades later, an older Elise works as a paranormal investigator with her two colleagues, Specs and Tucker, taking clients via phone calls. One day, Elise receives a phone call seeking for help. The client Ted Garza, claims that he has been experiencing paranormal activity in his house. He reveals that he is living in Elise's childhood home. Hesitant at first, she takes the job. Elise does a walk through the home that night, using a night vision camera so the others can see what she does. In the basement Elise is attacked by the ghost who tells Elise to "help her". Elise then informs them that she had seen the ghost before in her teenage years. The ghost is actually a bloodied girl with a chain attached around her neck. The police rescue the group and Elise is taken in for questioning.

While being questioned by the police Elise is startled by a ghostly vision of Melissa in the police station and realizes that she is in danger. Elise and Tucker proceeds to the basement to look for the ghost and search for the red door to enter The Further and rescue Melissa. As Elise examines a suitcase, she is ambushed by Key Face who takes her into The Further and leaves Elise's unconscious body in the real world.

Key Face tries to manipulate Elise to hurt her father much like he did to her as a child but Elise sees through the ruse and refuses to feed Key Face any more hate. Elise reunites with her mother and tries to apologize for her death, but her mother has already forgiven her. Realizing Melissa is dying, the trio move to leave The Further quickly. Melissa's spirit returns to her body, saving her life. Elise and Imogen return to the real world and quickly head to the hospital to reunite with Melissa and Christian. Christian forgives Elise and she gives him the whistle, they hug and Elise leaves for her home in California.