As with Sophie's World, this book is written in a magical, fantasy-like manner, littered with historical facts and references to Christianity concerning the birth of Christ.
Joachim, a young boy in an unnamed town in Norway, finds a magic Advent calender that unfolds a story of a little girl who travels back through time to the day of Jesus Christ's birth. The little girl, Elisabet stumbles upon several travelling companions, including angels, eastern kings, shepherds, and sheep. Joachim then helps solve the mystery of this other girl whose name was also Elisabet, apparently dissapeared from the same town a few decades back.
It's references to the Bible and the scene of nativity was quite cheesy and at times, quite predictable. The characters of the angels however did provide some comic relief, however lame it might've been. The flow and structure of the story left much to be desired, it was overall quite a dizzy experience.
Still, if you have a few asprins or idle hours to spare, this is still a good read ;)