The rise and fall of Khan Noonien Singh - Greg Cox

Earth, late twentieth century. The story continues . . .
The Chrysalis project -- an international consortium of scientists who have developed a group of genetically engineered men and women designed with superior intellect, strength and will -- have unwittingly unleashed a force which will prove their undoing. Designed to lead Earth into the twenty-first century, their experimental super-race has instead become Earth's nemesis.
For the disarmingly brilliant but ruthless Khan has gradually asserted his superiority even over his fellow enhanced creations. No longer content to simply adjust the course of Earth's destiny here and there, his drive has reached a frightening maturity: he is determined to seize control of the entire planet. Gary Seven, extraterrestial agent, together with his human colleague Roberta Lincoln, finds himself the final line of defence in a brutal struggle for the future freedom of Earth -- can they prevent Khan from attaining his goal of total domination?