In the climax of the movie, Elise Rainier (Lin Shaye), a gifted psychic, faces off against a powerful and malevolent entity named the Man Who Can’t Breathe. The entity is terrorizing Quinn Brenner (Stefanie Scott), a teenage girl who seeks Elise’s help in contacting her deceased mother.
In the resolution, Elise successfully confronts and defeats the Man Who Can’t Breathe, protecting Quinn from the supernatural threat. However, during the confrontation, Elise herself becomes targeted by another demonic entity, the Bride in Black, which is the same entity haunting the Lambert family in the previous films.
The film ends with Elise receiving a call for help from the Lambert family, setting the stage for the events of the first two “Insidious” movies. The final scenes also provide some closure for Quinn, who reunites with her father and continues the healing process after the supernatural ordeal.
In summary, “Insidious: Chapter 3” concludes with Elise’s successful intervention in protecting Quinn and hints at the interconnected nature of the “Insidious” series, with ties to the events of the original films. The movie explores themes of psychic abilities, supernatural entities, and the thin boundary between the living and the dead.