After a plague wipes out life on Earth, the survivors try to save the race. However, the agency formed to save humanity is bent on control of the survivors. Hugh and Jenna are two humans saved from Earth by cryogenic suspension. After they are revived, they are swept up into the struggle to save the race.
The Citadels were the pinnacle of law and order in the Empire. Fleeing the destruction of their own Universe, one of these mighty stations arrived in ours, taking position in the atmosphere of Saturn.