A group of four amateur adventurers who specialize in exploring remote and forsaken places pay a visit to Shookum Hills, a town in the remote Appalachian Mountains which was abandoned decades ago due to a mysterious coal mine fire.

Two dysfunctional couples rent a modern luxury desert home for the weekend hoping to sort out their messed-up lives. Just as they are about to settle in for a fun night, a neighbor turns up at their front door saying she has car trouble. But soon they discover the person they let into their home may have nefarious intents.

Helen tries to cope with the recent death of her husband, a scientist who killed himself right when he was on the verge of successfully completing the invention of a time machine. One day, she receives a phone call, and a voice suspiciously resembling her own voice warns her that she’s in danger. Is it possible Helen has time travelled? And what could have led her to do something like that?