Fergus, Polly and their three children live happily on Wood Farm in Norfolk. Everything is pretty normal, well as far as a busy farming household gets to normal. But one day, Polly has a premonition that stops her in her tracks. She can't shake off the feeling that something awful is going to happen. Her past premonitions have always come true and so the family take her words seriously. They bunker down in their farmhouse and prepare for...