I think in all Narnia series, boy and girl went to Narnia, and at first, they were not so brave or often have quarrel. But, after the great journey, they learn many things, and become very good friends at last. This one was also like that, but this underground journey and which was a little bit like solving was interesting. One more thing what I want to say is that the prince in Narnia is always good man and I like prince Rilian as well as prince Caspian.