M. Night Shyamalan directs this found-footage horror thriller starring Deanna Dunagan, Peter McRobbie and Kathryn Hahn. While their mother (Hahn) is on vacation, a young boy and girl (Ed Oxenbould and Olivia De Jonge) are sent to stay with their grandparents (Dunagan and McRobbie). After being warned not to leave their bedroom after 9.30pm and suspecting that something is amiss in the house, the kids start to investigate. But what they find is more frightening than they could ever imagine...

One day, while instructing a swim class, Luke Rhodes hears a strange ballad in his head that twists reality. After a series of terrifying events, he escapes through a black curtain and leaves a living nightmare behind. The ballad hasn't left him though. Pieces remain. And when the song surfaces... the nightmare returns. Joined by Luke's two wives and his miscreant friend Johnny Cruz, they resolve to discover the source of these "Lifemares," and, more importantly, how to escape them. But time is against them. Innocent people are dying and these freakish disturbances are devastating the world they know. Will Luke and his family find the singer of the Ballad before it's too late? Or will horrifying nightmares roam the world... forever?