Geology instructor Alex Cave receives an urgent message about an unusual event in Iceland: A huge spiral tunnel down into a dormant volcano. What he discovers at the bottom is an alien artifact more powerful than a nuclear weapon.
Janice Sloan steals the alien device, takes it into the Nevada desert, and turns it on. When it won’t shut down, she abandons the artifact and it begins dragging the moon closer to Earth.
The adventure doesn’t end when a huge emerald asteroid with a mass of solid gold is on a collision course with Earth and will impact in six days. His only chance of changing its trajectory is with the ancient artifact and he is running out of time. Can he find a way to save humanity from extinction?