Move over, Narnia. The journey to Ayda has begun. Sneaking out for a quick boat ride on a summer day, five children find themselves engulfed in a curtain of dense, powerful fog that transports them from the rocky coast to the mysterious island of Ayda. Rescued by Seaborne, a machete-toting wayfarer of few words, the children suddenly find themselves at the center of a centuries-old battle between Dankar, the ruler of Exor, and three siblings that rule the other realms of Ayda. At stake are the four stones of power and the elusive Fifth Stone that binds them all.