Fortress Of The Fire Child - John D. Hartman - Bog

In Return of the Fire Child, T.J. grudgingly accepted his destiny as the Fire Child, protector of the Inner World, a civilization located within the core of the Earth. Along with his three teen friends, Scott, Chad and Crash, he returned to the land of his birth to battle the evil that threatened not only his world but also the surface world where he had been raised. Pursued by a Gorgon and her legion of cats, they quickly learned that the Inner World was a land of myth filled with strange creatures and dangerous beasts such as the boys had never imagined.

In Quest of the Fire Child, T.J. sought to establish himself as the protector of his world and faced new dangers from ruthless men and creatures that wished to destroy him. Once again he must call upon his three friends who, along with the wolf boy, Criton, risk their lives attempting to bring peace to a world in turmoil. T.J. learned that his mother was still alive and he set out to rescue her from the brutish Mordraves. He also discovered that Scott is his half-brother and the bond between the two boys becomes stronger than ever before.
Now, in Fortress of the Fire Child, T.J. and his friends face further danger in the form of Aquatis, a ruthless shape shifter who once battled the Fire Child's father and who now seeks revenge against the son. Intrigue continues as Mathias, the T.J.'s arch enemy, reappears and attempts to regain the throne of Stonemass, the chief city of the Inner World. Further danger ensues as an army of mercenaries march forward to attack the Fortress, home of the Fire Child, and T.J. begins to doubt his own power pitted against such formidable odds.