Patrick Wilson and Vera Farmiga in 'The Conjuring'Warner Bros.

"The Conjuring," which arrives later this month from Warner Bros., is a big-budget period ghost story concerning a Rhode Island family (led by Ron Livingston and Lili Taylor) who enlist famed married paranormal investigators the Warrens (Patrick Wilson and Vera Farmiga) to rid their new home of supernatural horrors. You know, that old story.

What makes the creepy premise even creepier is that it's based on a real-life case, and the investigators, Ed and Lorraine Warren, are noted ghostbusters whose previous adventures have also been made into movies: "The Haunting in Connecticut" and the 1991 TV movie "The Haunted." They were also involved in the investigation of the house that inspired "The Amityville Horror."

The new trailer for "The Conjuring" double-underlines the film's real-world connection, which makes everything about a thousand times scarier.

"In 1971 the Perron family moved into their dream home," the trailer's narrator gravely intones. "What they didn't know: It was the site of a brutal murder in 1863 and countless horrors in the century that followed. What happened to the Perrons in that house was the Perrons have refused to speak about it... until now."

The trailer is then intercut with real-life footage of the Perron family, like patriarch Roger Perron, who says stuff like, "The owner said, 'Hey Roger, do yourself and your family a favor and keep the lights on in this house at night,'" plus tons of freaky scenes from the movie itself.

"The Conjuring" is set to possess theaters July 19.
The Conjuring- Trailer No.3