A cave, sealed shut for 15,000 years, is opened. Inside are the secrets of an ancient, forgotten race, secrets so powerful they could change the course of human history. . . . . . . . . . . . . . . Anna and her family have just moved into the vacant house on her grandparents' ranch, and she can't wait to explore the wide open spaces on horseback. But when she and her friend Martin discover a labyrinth of ancient underground caves, the exploration takes a thrilling, and dangerous, turn. In the depths of the caverns are discoveries beyond anything they could have imagined - the link to humanity's unknown past - discoveries that are ancient, priceless . . . and powerful beyond measure. But they have been followed into the caverns. On their trail is a greedy, ruthless businessman who will stop at nothing to get what they have found . . . and he is not the only thing following them. Can Anna and her friends save the discovery that could change the course of history - and survive?