Joséphine
Initial thoughts: As an Advent calendar of sorts I tremendously enjoyed The Christmas Mystery. It was also fun to trace their travels on a map and seeing the trail form from the beginning to the end. Had I read this as a book in a single sitting though, I might not have liked it as much. Despite the metaficitve approach to the book, it doesn't contain all that complexity. Nonetheless, it presents some very significant historical markers in a way that is memorable to children who might hear about some events and places for the first time.