You'd better not shout. You'd better not cry. You'd better watch out. I'm telling you why ... Somebody's coming to town. He's naughty and not very nice. And he wants to destroy Christmas. When the post boxes of Bramblebury mysteriously begin to disappear, Sam has just weeks before the biggest day of Santa's year to discover what's happening to all the Christmas mail. And then his sister vanishes too. Will he be able to find his sister and save Christmas, along with Santa's reputation, before the Delivery Book closes for the year? What he needs is a Christmas miracle.