The Sons of Heaven

Über

The Sons of Heaven is a science fiction novel written by Kage Baker. It is the last in her series of novels about The Company.
The Company, formally known as Dr. Zeus Inc., exists in the 24th century but employs immortal cyborgs to recover and save valuable artifacts in the past. The cyborgs are created by taking suitable children who would otherwise die and augmenting them with artificial components, physiological enhancements, and nanotechnology to continually repair their bodies so that they never age or die. In exchange for the gift of health and immortality they work to preserve the past for sale in the future.
Some cyborgs are corrupt, plotting against the Company and each other for the prize they expect to gain when they finally reach the 24th century, when they believe they will take over from the mortals who run the Company. Others despise mortals and plot to eliminate them. More benign factions try to counter them. Some individuals just want revenge.