What makes two species different from one another? The DNA of humans and chimpanzees differs only by 1.6%, but now a new species of humans has arisen, with their DNA also differing by 1.6%.
Dr Sloan Parker makes this discovery, and soon finds herself in danger. With the help of her co-workers and a renegade member of the new humans, she must prevent the replacement of the human race by a new, dominant species