The Amazing Adventures of Sullivan Green
by Denny Bastian
A twelve-year-old frog and his two boyhood pals go on an amazing adventure when they discover the way to the underground world of the Mole People. Unfortunately, it is also near the home of the evil Prince Hugh Derdy the rat who regularly brings his soldiers to take slaves. The boys want to return home but after a frightening night raid they are afraid that they may never see home again.