On a mission to pay the ransom of a new ally, apprentice Will and his friends find themselves in a desert wasteland awash with enemies.

Sixth-graders --and former best friends-- Jen and Martin are geared up to attend one of the most exciting geocaching field trip ever in the New Mexico desert. When their van gets a flat tire in the middle of nowhere, they decide to bike off on their own to get a head start. Without warning, a blinding wall of dust and debris barrels toward them. Separated from their field trip group and in the desert alone, they will have to use all their knowledge...