Insidious: Chapter 3 is a 2015 supernatural horror film written and directed by Leigh Whannell in his directorial debut. It is a prequel to the first two films and the third installment in the Insidious franchise. The film stars Dermot Mulroney and Stefanie Scott, with Angus Sampson, Whannell, and Lin Shaye reprising their roles from the previous films. The film was released on June 5, 2015, received mixed reviews and grossed $113 million against a budget of $11 million.
Several years before the Lambert haunting, retired demonologist Elise Rainier reluctantly uses her abilities to contact the spirit of teenager Quinn Brenner’s mother, Lillith, who died a year prior. However, she urges Quinn not to try and contact her mother again after sensing a malevolent force. After auditioning for a school for the performing arts, Quinn sees a mysterious figure waving to her from the distance on the street. Distracted, she is accidentally hit by a car, having both of her legs broken in the process.
Now stuck in her home with her father Sean and brother Alex, Quinn begins to experience increasingly disturbing paranormal phenomena, including seeing visions of a dark spirit wearing an oxygen mask known as the “Man Who Can’t Breathe”—the same figure that caused her accident.
Sean later tries to convince Elise, who like him is still grieving after the loss of her husband Jack, to help his daughter, but Elise declines, stating that her previous visits to the dark spiritual world of the “Further” made her realize that an evil spirit is hunting her. However, she is convinced by her friend and former colleague Carl to continue using her spiritual ability, after he reminds her about her successful case involving Josh Lambert in 1986, and stating that she is stronger than any spirits or demons because she is living and they are not.