This exciting story is about Professor Hardwigg, his nephew Harry and their guide Hans going to the center of the Earth through a volcano. They are led by an ancient Runic code, and they experience storms, pre-historic animals, seas, and cavemen. They keep on going, even though it is difficult to survive. I recommend this book to readers who like science fiction, action, and adventure books. This is great for ages 7 and up.
Jaehyung C., grade 7