A secret message put Axel and his uncle, Otto Lidenbrock, professor of mineralogy, into great adventures, leading them to descend all the way to the centre of the earth! "I carefully took the book in my hands, when suddenly through its pages slipped a small piece of paper folded in four. It was a secret message, the beginning of a great adventure for me and my uncle Otto Lidenbrock- the famous professor of mineralogy."
