There are two realms beyond what we see. In these realms lie the spirits that have passed on. There are those that can reach out to them, then there are the rest of us. Occasionally we try to reach out ourselves... The danger is, when you reach out to one, they all can hear you. That's what happened when Quinn attempted to reach her mom. She opened a door that is not so easily shut. When she reaches out for help, the person she reaches out to is dealing with her own personal hell. When danger is at the doorstep, a decision must be made. The decision will not only have an effect on their lives but on many lives to come. This third installment in the Insidious story is actually the beginning. It answers a lot of unanswered questions that the other movies left you scratching your head on. The first and second chapters were somewhat lacking in the horror department, this chapter makes up for it. There are some genuinely creepy moments that (if you're scared easily) will leave thou with the heebie-jeebies... So if you're sensitive this may not be for you but if you're a horror buff... You'll love it.
It is rated PG-13 but the rating should be R.