While Lea and Luis eagerly await the first snow, Petronella is busy getting her apple in order. Her sisters, the weather witches, come to visit. Amid all the pre-Christmas hustle and bustle, no one notices the strange guest who has settled in the mill. Santa Claus has unceremoniously dropped off the cheeky little elf during the last test drive. Now he is causing quite a stir in the miller's house. At first, no one suspects who is behind the pranks. Everyone is suspicious of each other, and trouble is brewing! Luckily, Petronella figures out in time who is causing the mischief and manages to prevent an even worse chaos. In the end, there is still a wonderful Christmas celebration - complete with snow. Thanks to the three weather witches!.