After a young couple witnesses a gruesome highway accident, they soon realize they did not leave the crash scene alone, as a demonic presence called the Passenger that won't stop until it claims them both turns their van life adventure into a nightmare.

A young woman studying the habits of webcam chat users from the apparent safety of her apartment witnesses a brutal murder online and is quickly immersed in a nightmare in which she and her loved ones are targeted for the same grisly fate as the first victim.