It's December 1952, and a dead stranger has been found lodged up the chimney of Holly House in the remote town of Elderby. Is he a simple thief, or a would-be killer? Either way, he wasn't on anyone's Christmas wish list. Inspector Frank Grasby is ordered to investigate. The victim of some unfortunate misunderstandings, he hopes this case will help clear his name. But as is often the way for Grasby, things most certainly don't go according to plan. Soon blizzards hit the North York Moors, cutting off the village from help, and the local doctor's husband is found murdered. Grasby begins to realise that everyone in Elderby is hiding something - and if he can't uncover the truth soon, the whole country will pay a dreadful price.