Pratchett Terry. Discworld 20. Hogfather (in English)

It's the night before Hogswatch. And it's too quiet.
There's snow, there're robins, there're trees covered with decorations, but there's a notable lack of the big fat man who delivers the toys...He's gone.Susan the governess has got to find him before morning, otherwise the sun won't rise. And unfortunately her only helpers are a raven with an eyeball fixation, the Death of Rats and an oh god of hangovers.
Worse still, "someone" is coming down the chimney. This time he's carrying a sack instead of a scythe, but there's something regrettably familiar...Ho. Ho. Ho.
It's true what they say.
'You'd better watch out. . '