Zane has always enjoyed exploring the dormant volcano near his home in New Mexico, even though hiking it is challenging. He'd much rather hang out there with his dog, Rosie, than go to middle school, where kids call him Sir Limps a Lot, McGimpster, or Uno--for his one good leg. What Zane doesn't know is that the volcano is a gateway to another world and he is at the center of a powerful prophecy.
A new girl at school, Brooks, informs him that he's destined to release an evil god from the ancient Maya relic he is imprisoned in--unless she can find and remove it first. Together they return to the volcano, where all kinds of crazy happens. Brooks turns into a hawk, a demon attacks them in a cave, and Rosie gives her all while trying to protect Zane.