It's Christmas Eve at the Merry Monarch. Nestled amongst the Yorkshire Dales, the pub is preparing to host its annual festive games night for its rabble of regulars. But this year, they are interrupted by a knock at the door from a stranger, stranded by the snow storm that's closing in on the village. And this won't be the only surprise of the night. When the power is cut off and darkness descends, the games turn deadly. It seems one of the group would kill to win.