How can the door knocker go rat-a-tat by itself? A cosy house surrounded by snow-covered hills seems the perfect place to spend the Christmas holidays, but the peace is disturbed by unexplained noises.
Who could have knocked at the door in the middle of the night? There are footprints in the snow, but nobody there! And what is it that Snubby can hear coming from the cellar?
Snubby goes to investigate – and mysteriously vanishes!
