It's not the house that is haunted. It's your son.

Josh and Renai have three children, the oldest is ten-year-old Dalton. As they begin to settle into a new home, they experience strange noises and other unexplained phenomena.

Soon Dalton is rushed to the hospital in a coma, suffering a severe head injury after falling in the attic.

Months slip by, and the doctors still have no explanation for his continuing coma. When the boy is returned home under his mother's care, more frightening events occur in the home.

The mother is so horrified that she moves the family to a another new home in hopes of leaving the fearful memories behind them.

The family quickly discovers that the haunting has nothing to do with their home. The supernatural outpouring is coming from their comatose son.

Several scientific experts observe the son, the family and their home. They determine that Dalton is trapped on the other side in a dark world they call The Further.

The parents team with the scientists to try to bring their boy back from The Further and save him from the clutches of a dark entity that hopes to claim him as his own.  

Insidious is the terrifying story of a family who shortly after moving discover that dark spirits have possessed their home and that their son has inexplicably fallen into a coma. Trying to escape the haunting and save their son, they move again only to discover that it was not their house that was haunted.

A young family discovers that the body of their comatose boy attracts evil entities, while the boy's mind is trapped in a dark realm known as The Further.

The film's script is written by Leigh Whannell, and the film is directed by James Wan. The film was filmed in Los Angeles in early 2010. The film was originally going to be called The Further.

This name was then changed to The Astral, before the name Insidious was eventually settled on. The film was shown during the 2010 Toronto International Film Festival.