The frog king, or iron henry

Let us tell you a magical story. There was once a beautiful princess who liked spending her time playing with a golden ball. But one day the ball fell into a well. The princess got so sad that the frog which lived in the well decided to help the poor girl. However in exchange for something. What did the frog want? Did the princess keep her promise? Was the golden ball worth the effort? How will this story end? If you want to find out, read "The Frog King, or Iron Henry".