Ward, David

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.

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.

Six young friends, tortured by the Spears and forced to work as slaves in the harsh fields of Grassland, vow to escape to find the freedom that was stolen from them long ago, and their opportunity arises when Outsiders come and wage war against the Spears.

Six young friends, tortured by the Spears and forced to work as slaves in the harsh fields of Grassland, vow to escape to find the freedom that was stolen from them long ago, and their opportunity arises when Outsiders come and wage war against the Spears.

Having left the harsh life in Grassland and finally returned to her home and father, Pippa and her friends must then go back to the land where they were slaves and try to forge a peaceful settlement with the Spears in order to avert tragedy for their village.

After tasting freedom, the former slaves are soon back under the control of the menacing Spears, and this time Corki and Pippa are separated as Corki, in training to be a Spear, seeks a way to work within the system to gain freedom for himself and his friends.

Pippa and the other villagers attempt to bring peace to the Spear culture when the Raiders who threatened Grassland and invaded her homeland return for revenge.