On his daily dog walk in the Peaks, Cary stumbles upon something otherworldly: a giant monolith, standing where he'd swear there was nothing before. Yet when he brings his family up to see it, the stone has inexplicably vanished. Only his son, Dru, chooses to believe him and joins the search. But out on the exposed moors with the mist finally lifting, Cary instead comes face-to-face with something that’s been there all along.