Insidious The last key is the prequel before the first two Insidious movies. Director Adam Robitel directed this horror/supernatural movie and this film didn’t disappoint me and my girlfriend. Unfortunately it left us some questions that didn’t give us the answer, but it’s a horrifying film to must see and the jump scares will really jump out of your seats. Some of the actors and actresses return for the fourth and really show us how scary this movie is. The question remains is this prequel really scary and must see it to believe it or what?