We have to save Christmas!

How long Sam has been waiting for the first of December! Now it's time for the coziness, the glow of the lights, the secrets, the cookie baking and the Christmas decorations. Even at school, everything is suddenly very exciting. Sam's teacher conjures up a magical Advent calendar, and each child is allowed to draw a slip of paper with the numbers 1 to 24. Whoever gets 24 has to take extra good care of it, otherwise Christmas might be cancelled, the teacher says with a wink. But then that's exactly what happens: Sam loses the slip of paper with the number 24! Fortunately, his friend Esme already has an idea how they can save Christmas!...