As summer ends, young Jonny reluctantly agrees to explore a local cave, expecting to find nothing more than bugs and dirt. But his quiet life is changed forever when he is inexplicably transported to a strange world filled with trolls, dragons, and powerful magic. While scrambling to discern friend from foe, he learns that dark forces threaten to spill beyond the limits of the magical realm into his own world. Alongside a group of legendary heroes, Jonny must race to save the realm from a growing horde of enemies as he uncovers more about an ancient villain who will stop at nothing for the power of a god.