Insidious: The Red Door has just been released, and where it sits on the scariness level compared to its predecessors couldn't be clearer. The series is about the Lambert family, who encounter malicious spirits in their home, most notably the Red-Faced Demon, who has become an iconic horror villain. The original 2010 movie sees the son trapped in a coma-like state and being tormented by the spirits. Insidious: Chapter 2 is about how Josh Lambert has become so connected to the spirit world. Insidious: Chapter 3 and Insidious: The Last Key follow different families from the Lamberts, but Insidious: The Red Door sees the return of the original family one last time.