"Based on a true story", this is the tale of paranormal investigators Ed and Lorraine Warren (portrayed by Patrick Wilson and Vera Farmiga). Although Ed is reluctant to take on any new cases because of how his wife was affected during the last one, he agrees to look into the weird things that are happening to the Perron Family. They recently purchased an old house where a witch used to live--and many of her victims still haunt the premises.
Although this is a very creepy movie, it throws in all the tried and true things that you'd expect in a haunted house/possession movie, from a creepy doll that's possessed by a demon, to lightning, to dead bodies hanging, to doors opening and closing, and reflections of ghosts in mirrors. If you're a fan of movies like THE AMITYVILLE HORROR and INSIDIOUS, you'll love this.