Christmas is well-known and much loved by everyone! However, Zoe, Mark's sister, is very young and doesn't know what it's all about. Fortunately, Mark is an expert in questions: from the Christmas tree to the festive table, he can explain everything to her. But, Mark, did you forget something? Christmas is not just about receiving gifts, it's also about thinking of others and sharing! A series of books featuring Mark, a little boy who learns something new every day through what happens to him and the questions he asks! Just like every child! Just like you!