The Chronicles of Narnia wants to be the new Harry Potter. And how are its makers going to do it? By offering schools teaching aids based on the movie. Charlotte Higgins reports on the rise of 'stealth marketing'. On December 9, familiar characters from one of our most famous and beloved children's books will variously shamble, stalk and caper on to our cinema screens: Mr Beaver, the White Witch and Mr Tumnus, along with the human children Peter, Susan, Edmund and Lucy. [More]