5 second plot: Quinn wants to contact her deceased mom. But something else answers. She's going to need help to get rid of it.
5 second review: This Chapter 3 takes place before the other Insidious movies. There's not very much new going on here. It's got classic jump scares and standard creepy ghost stuff. But since I'm a big sucker for this shit, it scared the bejesus out of me. So I would say 'mission accomplished'.