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.
When a symposium takes Dr. Graham to the Perimeter One space station at the edge of the solar system, sabotage places his entire family in terrible danger.
Chris Graham, a student at a science academy on one of Jupiter's moons, becomes involved in a secret project to build a sentient humanoid, not knowing that the device is intended for destruction.
