Europe under Draka rule
The second book, Under the Yoke
, is a horrific vision of Europe under Draka rule. Tanya von Shrakenberg established a plantation in formerly-French Touraine Province. Her slaves include Marya Sokolowska and Chantal Lefarge, formerly a Polish nun and a French Communist respectively. (Note that Skłodowska is the maiden name of Marie Curie; it is not clear whether the fictional character is intended to be an alternate-history version of the chemist, but from the description of her intelligence, it seems likely). Chantal Lefarge is raped by her master, and impregnated with twins. Later, she escapes to the USA on a submarine. In New York City, she gives birth to Fred and Marya Lefarge (named after her rescuers), who will later become key intelligence assets for the OSS during the Protracted Struggle.
Fred Kustaa, agent for the Alliance secret service (the OSS), attempts to keep a resistance movement alive in Europe. He smuggles weapons to guerillas in Finland, and later attempts to smuggle the German professor Ernst Oerbach, who has vital knowledge on nuclear fusion. Marya Sokolowska is Fred's contact in this second mission. Fred Kustaa's American perspective on precedings in the Domination cuts through the pretenses of Draka rule much more effectively than the occasional, self-aware and arrogant statements of Draka characters and brings home to the reader the sheer horror of Draka society, especially in regard to the blinkered and mildly sociopathic mindsets of the serfs who wish to simply get on with their lives, the resistance characters are an intense breath of fresh air as the minds of both Draka and serf become more and more alien to the reader.
Eventually, the Draka ruthlessly crush all resistance in Europe. Finland is almost completely depopulated (by 1947 the Finnish guerillas estimate that there are less than 250,000 Finns left in the entire country; many having died by their own hand rather than let the Draka use them as hostages) and, in 1952, when a rebellion takes over the city of Barcelona, the Draka respond with a thermonuclear bomb. Ukraine suffers a massive population loss in the wake of the initial Draka invasion, not because of a deliberate policy of genocide, but because the civilian population means nothing to them until they're properly 'domesticated', along with the typically Draka calculation that many of the survivors will be more likely to accept The Yoke if that's the only way to get fed. This total disregard for non-Draka life carries through as the Draka advance further into Europe, with mass-starvation everywhere behind their lines leading to the deaths of tens of millions. By 1945 Europe has been reduced to the kind of barbarism that the Draka are specifically experienced in exploiting, and the task of breaking the will of the survivors begins in earnest.
Under the Yoke contains a deliberately horrific description of the impalement of several guerrilla soldiers, disgusting even the Draka who ordered it—who nevertheless considers it a necessary means of impressing upon the slaves that resistance is futile. Thus, they will obey more willingly, making it possible for the Draka to be less harsh—giving rise to even further willingness to obey. The Draka have been slavemasters for two hundred years, and have applied modern science to the problem of breaking human wills; they are extremely good at it. Indeed, this feeds further into their ideology of the Draka as a master race, capable of enforcing their will with no other tool than raw willpower.
The Protracted Struggle
The third book, The Stone Dogs
, tells the story of the Protracted Struggle — the ultra-nasty Cold War between the Domination of the Draka and the Alliance for Democracy. There is a far more intense space race in this world, with pulse-drive interplanetary spaceships and colonies and military bases established on the Moon, on Mars and in the asteroid belt. Over a period of several decades, the Alliance secretly constructs an antimatter-driven starship for transporting 100,000 people to Alpha Centauri. The Draka employ the policy of "No peace beyond Luna," leading to frequent skirmishes in the inner solar system. The third book also details the life of Eric von Schrakenberg's niece, Yolande Ingolffson. Eric later becomes the Archon during the "Final War."
The conquest of India
In the 1970s, there is a major setback for the Free World. An OSS covert operation, designed to discredit a Hindu nationalist party and keep India in the Alliance, backfires. As a result India secedes from the Alliance — and is conquered and enslaved by the Draka within weeks (except Burma, which counter-seceded back to the Alliance). After the 'Indian Incident' the Alliance for Democracy is formally converted into a single superstate. During the Draka conquest of India, Marya Lefarge is taken prisoner. She becomes a serf to Yolande Ingolffson, who after torturing her repeatedly with a neural weapon, forces her to become a "brooder" (i.e. a surrogate mother) for her offspring, Gwendolyn. Yolande also swears vengeance on Fred Lefarge after he kills her lover, Myfwany Venders, during the Indian Incident.
The much larger free population of the Alliance gives it an edge in physics and computer technology, while the Domination gains the upper hand in the biological sciences allowing them to perfect their genetic engineering techniques by using their slave population as test subjects. They finish the Human Genome Project and are performing significant genetic alteration on mammalian organisms, including humans, by the mid-1970s. Both sides develop super-weapons with which to launch the first strike of the inevitable final war. However, both sides recognize that the long-term trends are in the Alliance's favor. Due to its much-larger economy and free population the Alliance's lead in overall scientific progress slowly grows, with the stagnant Draka increasingly dependent on espionage and Alliance defectors for new innovations.
The war finally breaks out in 1998 when the Draka, about to lose the secrecy of their superweapon, decide to use it preemptively instead. Drakan advantages in bioscience allowed it to create a bio-psychological virus, "The Stone Dogs" (implicitly derived from HIV). This virus lies dormant but causes the host to go violently insane when activated by precisely modulated radio waves. The Alliance counterpart, a computer virus designed to disable Draka systems, works well but is not as effective at disabling whole military hierarchies. Information technology is generally not as well advanced as the real Earth's, and so the computer virus works relatively slowly.
Due to the Stone Dogs virus, Draka forces ultimately succeed—if barely—in wiping out all significant Alliance populations and military forces in the Earth-Luna sphere, suffering approximately 15 percent total casualties; they also succeed in wiping out the government of the Alliance via the same virus. Some Alliance populations on Earth survive this assault (The Stone Dogs mentions the Draka facing partisan resistance upon starting to "pacify" North America); however, others destroy either themselves or Allied targets (such as London); Japan bombs itself and Korea. Alliance forces prove victorious in the asteroid belt. What could be a standoff is defused by the Archon, who offers Draka citizenship to spaceside Alliance survivors (though without voting rights for themselves, though their descendants will be fully equal). As part of the deal, the holdouts are able to launch their starship. This will allow the Draka to concentrate their resources on pacifying and rehabilitating Earth. Ultimately, the Solar System belongs to the Draka. The war itself proves to be devastating to Earth. The planet's ecosystems were pushed nearly to the breaking point, with a nuclear winter lasting for several years (there are references to ice forming in the Adriatic Sea)—despite the near exclusive use of 'clean' fusion weapons and kinetic weapons.
Near-extinction of "Homo Sapiens" on Earth
At some intervening period, before the next book in the series, the Draka produce a genectically altered new serf race, Homo Servus, which is psychologically incapable of rebelling. Thus they can dispense with the brutal repression needed earlier, and entrust serfs with sensitive positions such as theoretical physics. The "right" of Drakas to have sex (both heterosexual and homosexual) with any Homo Servus which catches their fancy is taken for granted; such sex cannot lead to pregnancy, since Draka and serfs are now two separate species, specifically designed to be incapable of propagating offspring together.
There is no mention of how the "changeover" was managed - presumably, either by the sterilization of male serfs and impregnating female ones with genetically engineered Homo Servus embryos or by sterilizing the old serfs of both genders and producing the new ones in laboratories. By the standards of our timeline, both would count - even if the "Old Model" serfs were allowed to live out their lives - as a huge act of genocide.
Of Homo Sapiens, only a few scattered "feral humans" survive precariously on Earth, mainly in North America, having been quite literally bombed back into the Stone Age and being hunted "for sport" by the Draka.