The plot is simple, but makes room for several twists. First off we meet the family. Renai (Rose Byrne), Josh (Patrick Wilson) and their two sons, Dalton (Ty Simpkins) and Foster (Andrew Astor) have recently moved into a new house, but their lives take a dark turn when one day their older son Dalton, falls into a coma, for no apparent reason. Even the doctors can't find anything wrong with him. Three months later, when they bring the comatose boy home, weird phenomenons begin to manifest in the house. Or, should I say, paranormal activities ? Renai convinces Josh they should move into another house and the husband agrees, so they move. But, the supernatural events continue to show up in the new house as well. Suspecting the fact that it has something to do with Dalton's condition, Josh's mother Lorraine (Barbara Hershey) contacts a psychic friend of hers, Elise (Lin Shaye) who tries to help the young couple find out what's happening. I won't go into too much detail except to say that Dalton is not just in a coma. He has been taken deep into a supernatural realm, called The Further, by a malevolent entity which means to hold on to his soul. The plot does reserve some twists, but I will not reveal them here.
It's easy to think of "Insidious" as a roller-coaster ride, because it sort of is. The thrills and scares are relentless. Some might view the third act as a weak attempt to turn the movie into something a bit more action-oriented. It sort of is just that, but it's not a cop-out. There will also be those who might be discouraged by the all-too-familiar plot elements, but the director and writer show a lot of respect for the material. I assure you, it's a ride worth taking, at least once, alone, in a dark room.