After a series of vicious crimes by a renegade group of cowboys, led by "Red Jack" Stilwell, a legendary tracker, Noble Adams is pulled out of retirement to capture Stilwell, dead or alive. Reluctantly, needing more men, he allows his son, Tom to tag along, revealing to Tom a whole brutal side of ruthlessness Noble thought he left behind.
When her archaeologist father disappears on an expedition, Wanda sets out to look for him. What she finds is a secret underground world, where no one believes in life on the surface and where she and her father are taken for spies.