The government's new urban renewal policy results in street gangs fighting for control of the inner cities. While most of the residents flee, one factory owner determines to fight the gangs for his property.

A party of tourists -- including a state senator, a park ranger who was her one-time lover, a cantankerous professor, and an escaped convict -- are trapped deep inside the caverns of an unnamed national park, rescued briefly, and then caught in a second cave-in.