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.