Perimeter One Adventure
2 primary works
Book 3
When Ryan Graham goes to New Denver to interview an arrogant scientist who plans a daring experiment in time travel, the Graham family and others are drawn into a race to keep the universe from being destroyed.
Book 4
Having run into a ruthless plot to seize control of the mining colony they are visiting on Venus, the Grahams take refuge with underground dwellers who have been secretly practicing Christianity.