Downton Abbey meets Agatha Christie with a touch of Wodehouse and a dog of distinction. It's 1920 and Christmas is coming. Major Lennox finds a body on his doorstep - why on his doorstep? Was it to do with the Countess? Was it about the ruby necklace? Lennox must go to Melrose Court, home to his uncle, Lord Melrose, to uncover the mystery. But then the murders start and it snows and suddenly everything becomes very complicated...