The movie centres around a little girl named Em, who goes to a yard sale and buys an antique box, which turns out to be haunted by an evil spirit.
And The Closer star, who plays the child's mum, admits she struggled to keep her wits about her since the project was inspired by a real series of events.
She tells the New York Post, ""This is based on a true story. In real life, there's this guy who bought one little box at a flea market, and suddenly evil things happened. He then sold it, and that person got sick. They resold it, and again something bad happened.""