The Subterrene War books (Germline and its sequel, Exogene) takes the reader miles below Kazakhstan, the frontline of a war over mineral rights fought between Russia and the United States. The conflict escalates when the Americans introduce their newest weapon: a line of genetically-engineered troops. Faced with this inhuman enemy, the Russians scramble to field their own biologically enhanced soldiers, in the process setting off a brutal new arms race that might end with humanity obsolete.