Insidious: The Red Door

The Lambert family comes together for the funeral of Josh's mother, Lorraine. Josh, who had been living with Lorraine after his split from Renai, is now faced with this loss. Following the funeral, Renai urges Josh to spend time with their son Dalton, who is about to start college. Dalton, who has always had a passion for fine arts, decides to pursue this field in his higher education.

Despite his packed college schedule, Josh agrees to Renai's request and drives Dalton. On the way, he tries to mend the fragile bond with Dalton that was strained by the divorce. Unfortunately, Josh's efforts backfire, creating even more tension between him and his son.

In a philosophy of art class, Dalton's lecturer encourages him to explore his memories and experiences. This reopens a door to a world that had been shut for ten years. Meanwhile, Josh starts seeing things that aren't there and goes to a doctor, only to realize these are not just hallucinations, but disturbances caused by spirits.

Dalton and Josh soon find themselves facing these spirits – old adversaries from a decade ago who have now resurfaced. This confrontation brings to light long-hidden conflicts and mysteries within the family.