It’s a sequel to “Insidious: Chapter 3,” but a prequel to the original “Insidious.” Following the chronology of the “Insidious” movies can be a bit tough thanks to all the flashbacks and prequeling the movies are doing. So here’s a quick rundown of the “Insidious” films’ stories, and everything that happens, in chronological order, as well as an explanation of its ghostly concepts. 1986 First mentioned in “Insidious” and shown in flashbacks in “Insidious: Chapter 2,” 1986 is when Elise Rainier (Lin Shaye) first met Josh Lambert (Patrick Wilson).