When a top-secret weapon goes missing on Colonel Maggie Black's watch, her honor and her career are on the line. But finding her experimental missile won't be easy --- thanks to the revenge-fueled ambitions of Asdrubal Torres, whose hallucinatory encounter with the Great Spirit challenges him to refill Lake Cahuilla, the ancient inland sea that once covered much of southern California. To fulfill his blessed mission, Torres needs wizardry and weaponry, and the Great Spirit provides both. It turns into a race against time for Maggie and Jordan, who together must stop Torres from destroying Hoover Dam --- and turning the Colorado River into a tsunami that would kill hundreds of thousands and wipe out the Southwest's water supply.