With their search for the Scorpion's Jewel completed, Jesse, Rae and Silas return to rescue their injured friend, Parvel, only to find he has been kidnapped by the Rebellion. While trying to evade the Patrol, this time the Youth Guard's journey leads to the mountains, where they are held captive by a dwarf. Underground, the young warrriors discover a lost civilization, and a new friend with vital information to help them on their way. But the Rebellion headquarters are hidden within a dangerous maze of tunnels, and accessible only by solving a series of riddles. Will Jesse and his friends discover the secret to the Rebellion's tunnels and reach Parvel before it is too late? Or will they be doomed to dwell in darkness forever?