Waking Power — Thomas W. Brucato

A message has come to Reece and Ariana from one of the northern kingdoms. A mysterious cave has been discovered containing a magical barrier, and no wizard has proven powerful enough to transcend that barrier and discover what is within. With a group of soldiers and wizards, the young king and queen set out for the cave, eager to dispel the mystical shield and uncover the cave's secrets. What they find is a puzzle, a set of clues they must decipher before they can hope to gain access. Eventually finding themselves in a whole new land, a realm previously unknown to all of Davanon, they learn terrible secrets that they cannot ignore. For with this whole new land also comes, inevitably, a whole new evil….